OSPF protocol configuration

Table of content

Description

The OSPF configuration is performed only via CLI. A separate command shell with several modes is used to configure the OSPF protocol (Figure 1). The transition to each mode is performed using commands having the same name as the mode. A detailed description of the commands is available in the Technical documentation.

Mode name	Description
Basic	The basic OSPF mode is used to analyze the output of the diagnostic commands and to switch to the configuration mode. Switching to the basic mode is performed from the WANFleX command shell using the "ospf" command. BS_1#1> ospf OSPF>
OSPF configuration	The configuration mode allows to manage the OSPF service running on the device and to proceed to the additional configuration modes: router, interfaces or route-maps. The switching to the OSPF configuration mode is performed from the basic mode using the "config" command. OSPF> config OSPF(config)#
OSPF router configuration	In the router configuration mode, the basic OSPF settings can be performed. This mode allows to configure the networks, the areas, the router ID, etc. The switching to the OSPF router configuration mode is performed from the configuration mode using the "router" command. OSPF(config)# router OSPF(config-router)#
OSPF interface configuration	The OSPF interface configuration mode allows to configure the protocol settings related to a specific interface. The switching to the OSPF interface configuration mode is performed from the configuration mode using the "interface IFNAME" command. OSPF(config)# interface rf5.0 OSPF(config-if)#
Route-maps configuration	The route-maps configuration mode allows to configure the rules that should be applied to the announced or received OSPF routes. The switching to the OSPF route-map configuration mode is performed from the configuration mode using the rule creation command "route-map WORD (deny\|permit) <1-65535>". OSPF(config)# route-map MAP permit 10 OSPF(config-route-map)#

ospf_shell

Figure 1 - Switching between the OSPF command shell modes

Each OSPF shell mode provides help by displaying the full list of supported commands. To display the list use the "help" command.

The routing table can be displayed using one of the following commands:

From WANFleX command shell:
BS_1#1> netstat -r

From OSPF command shell:
OSPF> show route

From ARDA command shell:
ARDA> show route

Network scheme with one OSPF area

To demonstrate how to configure the OSPF protocol and analyze the diagnostic commands output, let's look at the example of the scheme with one OSPF area (Figure 2):

The network consists of three wireless devices BS1, CPE2, CPE3 configured as routers.
Wireless devices build the OSPF backbone area.
BS1 has an external link for connecting to LAN-1 network.
The CPE3 router is connected to the outside router R1.To make the R1 router networks available, static routes to the networks 192.168.5.0/28 and 192.168.6.0/28 have been added to CPE3.
Routers BS1, CPE2 and CPE3 use as identifiers the addresses assigned to the loopback interface: 192.168.0.1/32, 192.168.0.2/32 and 192.168.0.3/32.

Figure 2 - Network scheme with one OSPF area

Pre-configuration

Description	Perform a devices preliminary configuration consisting of the following steps: Configure device ID. Remove svi1 interface. Assign IP addresses to network interfaces, according to the scheme. Add static entries to the routing table. Disable switching. Set wireless links.
BS1	Set device ID system prompt BS_1 Remove svi1 interface ifc svi1 destroy Assign IP addresses ifc eth0 10.10.10.1/24 ifc rf5.0 172.16.0.1/29 ifc lo0 192.168.0.1/32 Disable switching switch stop Set wireless links rf rf5.0 band 20 rf rf5.0 freq 5000 mint rf5.0 -name "BS_1" mint rf5.0 -type master
CPE2	Set device ID system prompt CPE_2 Remove svi1 interface ifc svi1 destroy Assign IP addresses ifc eth0 10.10.20.2/24 ifc rf5.0 172.16.0.2/29 ifc lo0 192.168.0.2/32 Disable switching switch stop Set a wireless link mint rf5.0 -name "CPE_2" mint rf5.0 -type slave mint rf5.0 prof 1 -band 20 -freq 5000 -type slave
CPE3	Set device ID system prompt CPE_3 Remove svi1 interface ifc svi1 destroy Assign IP addresses ifc eth0 10.10.30.3/24 ifc rf5.0 172.16.0.3/29 ifc lo0 192.168.0.3/32 Add static routes route add 192.168.5.0/28 10.10.30.1 route add 192.168.6.0/28 10.10.30.1 Disable switching switch stop Set a wireless link mint rf5.0 -name "CPE_3" mint rf5.0 -type slave mint rf5.0 prof 1 -band 20 -freq 5000 -type slave

OSPF configuration

Description	Configure OSPF protocol in accordance with scheme. Step 1: start OSPF. Step 2: set routers IDs. The identifiers will be equal to the IP addresses assigned to the loopback interface. Step 3: define the interfaces where OSPF should be started. All interfaces are connected to the backbone area according to the scheme. On the BS1 and CPE3 routers, set the networks assigned to one of the device interfaces. On the CPE2 router, set all networks using one entry 0.0.0.0/0. This entry includes all networks and enables OSPF support on all router interfaces; when some device interfaces is connected to a new network, this network will be immediately announced via OSPF. This approach doesn't require additional OSPF configuration, but decreases control over announcements. In addition, this command announces the address 127.0.0.1/32 assigned to the loopback interface and does not announce the address 192.168.0.2/32, therefore, this network must be additionally specified. Step 4: make redistribution of directly connected networks on the BS1 router and static routes on the CPE3 router. Step 5: configure passive interfaces. The CPE3 eth0 interface is connected to the outside router R1, so no neighbor relationship should be established on this interface. Network 10.10.30.0/24 associated with the eth0 interface must be announced via OSPF, so the eth0 interface must be set as passive.
BS1	Start OSPF ospf start Set router-id ospf config router router-id 192.168.0.1 Start OSPF on interfaces ospf config router network 172.16.0.0/29 area 0.0.0.0 network 192.168.0.1/32 area 0.0.0.0 Connected routes redistribution ospf config router redistribute connected
CPE2	Start OSPF ospf start Set router-id ospf config router router-id 192.168.0.2 Start OSPF on interfaces ospf config router network 0.0.0.0/0 area 0.0.0.0 network 192.168.0.2/32 area 0.0.0.0
CPE3	Start OSPF ospf start Set router-id ospf config router router-id 192.168.0.3 Start OSPF on interfaces ospf config router network 10.10.30.0/24 area 0.0.0.0 network 172.16.0.0/29 area 0.0.0.0 network 192.168.0.3/32 area 0.0.0.0 Static routes redistribution ospf config router redistribute kernel Passive interfaces configuration passive-interface eth0

Command output analyzing

Neighbors list

Description	Analyze neighors list output. The routers are connected by the 172.16.0.0/29 network, which is broadcast (using the MINT protocol), so: CPE3 is selected as DR, its router-id is highest. CPE2 is selected as BDR, its router-id less than CPE3, but more than BS1. BS1 is DROther. The routers have established a Full relationship.
BS1	OSPF> show neighbor Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL 192.168.0.2 1 Full/Backup 00:00:38 172.16.0.2 rf5.0:172.16.0.1 0 0 0 192.168.0.3 1 Full/DR 00:00:38 172.16.0.3 rf5.0:172.16.0.1 0 0 0
CPE2	OSPF> show neighbor Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL 192.168.0.1 1 Full/DROther 00:00:33 172.16.0.1 rf5.0:172.16.0.2 0 0 0 192.168.0.3 1 Full/DR 00:00:35 172.16.0.3 rf5.0:172.16.0.2 0 0 0
CPE3	OSPF> show neighbor Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL 192.168.0.1 1 Full/DROther 00:00:31 172.16.0.1 rf5.0:172.16.0.3 0 0 0 192.168.0.2 1 Full/Backup 00:00:37 172.16.0.2 rf5.0:172.16.0.3 0 0 0

LSDB content

Description

Analyze LSDB. Since the scheme contains one area, the LSDB output on all routers will be identical:

LSA type 1 (Router Link States): LSDB contains three LSA type 1 from each of the area routers. Note, each LSA can contain a lot of information. For example, LSA type 1 generated by CPE2 contains information about neighbors, about 172.16.0.0/29, 10.10.20.0/24 networks and its own identifier.
LSA type 2 (Net Link States): CPE3 router as DR generates one LSA type 2.
LSA type 5 (AS External Link States): by default, one LSA type 5 is generated for each external route, therefore LSDB contains three LSA type 5 about routes to external networks: routes to networks 192.168.5.0/28 and 192.168.6.0/28 were generated during redistribution of CPE3 static routes, route to network 10.10 .10.0 / 24 is generated by BS1 during redistribution of a directly connected network.

BS1, CPE2, CPE3

OSPF> show database

       OSPF Router with ID (192.168.0.1)(192.168.0.1)

                Router Link States (Area 0.0.0.0)

Link ID         ADV Router      Age  Seq#       LS-Age Link count
192.168.0.1     192.168.0.1      202 0x80000008   7442 2
192.168.0.2     192.168.0.2      201 0x80000008   7405 3
192.168.0.3     192.168.0.3      204 0x8000000a   7407 3

                Net Link States (Area 0.0.0.0)

Link ID            ADV Router      Age  Seq#       LS-Age Routers
172.16.0.3/29      192.168.0.3      204 0x80000006   7407 3

                AS External Link States

Link ID         ADV Router      Age  Seq#       LS-Age Route
10.10.10.0      192.168.0.1      122 0x80000007   7442 E2 10.10.10.0/24      [0x0]
192.168.5.0     192.168.0.3      169 0x80000007   7407 E2 192.168.5.0/28     [0x0]
192.168.6.0     192.168.0.3      299 0x80000007   7407 E2 192.168.6.0/28     [0x0]

Routing table

Description	The routing tables of wireless devices, contains entries that each device has information about each subnet shown in the scheme. This means that the devices have successfully exchanged routing information and added it to the FIB. Note, the loopback interfaces addresses do not depend on the links state, therefore they can be used to manage devices in redundant networks.
BS1	BS_1#1> netstat -r Routing tables Destination Gateway Flags Refs Use Interface 10.10.10.0/24 link#2 UC 0 0 eth0 10.10.20.0/24 172.16.0.2 UG3 0 0 rf5.0 10.10.30.0/24 172.16.0.3 UG3 0 0 rf5.0 127.0.0.1 127.0.0.1 UH 3 141 lo0 172.16.0.0/29 link#3 UC 0 0 rf5.0 192.168.0.1 192.168.0.1 UH 0 0 lo0 192.168.0.2 172.16.0.2 UGH3 0 0 rf5.0 192.168.0.3 172.16.0.3 UGH3 0 0 rf5.0 192.168.5.0/28 172.16.0.3 UG3 0 0 rf5.0 192.168.6.0/28 172.16.0.3 UG3 0 0 rf5.0 224.0.0.0/8 127.0.0.1 UGS 1 1561 lo0
CPE2	AS_2#2> netstat -r Routing tables Destination Gateway Flags Refs Use Interface 10.10.10.0/24 172.16.0.1 UG3 0 0 rf5.0 10.10.20.0/24 link#2 UC 0 0 eth0 10.10.30.0/24 172.16.0.3 UG3 0 0 rf5.0 127.0.0.1 127.0.0.1 UH 3 50 lo0 172.16.0.0/29 link#3 UC 0 0 rf5.0 192.168.0.1 172.16.0.1 UGH3 0 0 rf5.0 192.168.0.2 192.168.0.2 UH 0 0 lo0 192.168.0.3 172.16.0.3 UGH3 0 0 rf5.0 192.168.5.0/28 172.16.0.3 UG3 0 0 rf5.0 192.168.6.0/28 172.16.0.3 UG3 0 0 rf5.0 224.0.0.0/8 127.0.0.1 UGS 1 2037 lo0
CPE3	AS_3#1> netstat -r Routing tables Destination Gateway Flags Refs Use Interface 10.10.10.0/24 172.16.0.1 UG3 0 0 rf5.0 10.10.20.0/24 172.16.0.2 UG3 0 0 rf5.0 10.10.30.0/24 link#2 UC 0 0 eth0 127.0.0.1 127.0.0.1 UH 3 155 lo0 172.16.0.0/29 link#3 UC 0 0 rf5.0 192.168.0.1 172.16.0.1 UGH3 0 0 rf5.0 192.168.0.2 172.16.0.2 UGH3 0 0 rf5.0 192.168.0.3 192.168.0.3 UH 0 0 lo0 192.168.5.0/28 10.10.30.1 UGS 0 0 eth0 192.168.6.0/28 10.10.30.1 UGS 0 0 eth0 224.0.0.0/8 127.0.0.1 UGS 1 1745 lo0

Scheme with several areas

Let's look at the example of a network scheme with several OSPF areas (Figure 3):

The network consists of four wireless devices BS1, CPE2, CPE3, CPE4, configured in the router mode.
Wireless devices creates three OSPF areas:
- area 0: routers BS1 and CPE2 are connected to the area. The BS1 router has an external link;
- area 3: routers BS1 and CPE3 are connected to the area, the area is NSSA type. CPE3 router has an external link with a outside router R1 and two static routes to networks 192.168.5.0/28 and 192.168.6.0/28;
- area 4: routers BS1 and CPE4 are connected to the area, the area is Stub type.
Routers BS1, CPE2, CPE3 and CPE4 use the addresses assigned to the loopback interface as identifiers: 192.168.0.1/32, 192.168.0.2/32, 192.168.0.3/32 and 192.168.0.4/32.

Figure 3 - Network scheme with several OSPF areas

Pre-configuration

Description	Perform a devices preliminary configuration consisting of the following steps: Configure device ID. Remove svi1 interface. Assign IP addresses to network interfaces, according to the scheme. Add static entries to the routing table. Disable switching. Set wireless links.
BS1	Set device ID system prompt BS_1 Remove svi1 interface ifc svi1 destroy Assign IP addresses ifc eth0 10.10.10.1/24 ifc rf5.0 172.16.0.1/30 ifc rf5.0 172.16.3.1/30 ifc rf5.0 172.16.4.1/30 ifc lo0 192.168.0.1/32 Disable switching switch stop Set radio link rf rf5.0 band 20 rf rf5.0 freq 5000 mint rf5.0 -name "BS_1" mint rf5.0 -type master
CPE2	Set device ID system prompt CPE_2 Remove svi1 interface ifc svi1 destroy Assign IP addresses ifc eth0 10.10.20.2/24 ifc rf5.0 172.16.0.2/30 ifc lo0 192.168.0.2/32 Disable switching switch stop Set radio link mint rf5.0 -name "CPE_2" mint rf5.0 -type slave mint rf5.0 prof 1 -band 20 -freq 5000 -type slave
CPE3	Set device ID system prompt CPE_3 Remove svi1 interface ifc svi1 destroy Assign IP addresses ifc eth0 10.10.30.3/24 ifc rf5.0 172.16.3.2/30 ifc lo0 192.168.0.3/32 Add static routes route add 192.168.5.0/28 10.10.30.1 route add 192.168.6.0/28 10.10.30.1 Disable switching switch stop Set radio link mint rf5.0 -name "CPE_3" mint rf5.0 -type slave mint rf5.0 prof 1 -band 20 -freq 5000 -type slave
CPE4	Set device ID system prompt CPE_4 Remove svi1 interface ifc svi1 destroy Assign IP addresses ifc eth0 10.10.40.4/24 ifc rf5.0 172.16.4.2/30 ifc lo0 192.168.0.4/32 Disable switching switch stop Set radio link mint rf5.0 -name "CPE_4" mint rf5.0 -type slave mint rf5.0 prof 1 -band 20 -freq 5000 -type slave

OSPF configuration

Description	Let's configure the OSPF protocol in accordance with the scheme. Step 1: start OSPF. Step 2: configure routers IDs. The identifiers will be equal to the IP addresses assigned to the loopback interface. Step 3: define the interfaces where OSPF should be started. All interfaces are connected to the backbone area according to the scheme. Step 4: define the areas types: area 3 - NSSA, area 4 - Stub. Note, the area type must be configured on all routers connected to that area, otherwise they will not establish neighbor relationships. Step 5: make redistribution of directly connected networks on the BS1 router and static routes on the CPE3 router. Step 6: configure passive interfaces.
BS1	Start OSPF ospf start Set router-id ospf config router router-id 192.168.0.1 Start OSPF on interfaces ospf config router network 172.16.0.0/30 area 0.0.0.0 network 172.16.3.0/30 area 0.0.0.3 network 172.16.4.0/30 area 0.0.0.4 network 192.168.0.1/32 area 0.0.0.0 Set area types ospf config router area 0.0.0.3 nssa area 0.0.0.4 stub Redistribute connected routes ospf config router redistribute connected
CPE2	Start OSPF ospf start Set router-id ospf config router router-id 192.168.0.2 Start OSPF on interfaces ospf config router network 10.10.20.0/24 area 0.0.0.0 network 172.16.0.0/30 area 0.0.0.0 network 192.168.0.2/32 area 0.0.0.0
CPE3	Start OSPF ospf start Set router-id ospf config router router-id 192.168.0.3 Start OSPF on interfaces ospf config router network 10.10.30.0/24 area 0.0.0.3 network 172.16.3.0/30 area 0.0.0.3 network 192.168.0.3/32 area 0.0.0.3 Set area types ospf config router area 0.0.0.3 nssa Redistribute static routes ospf config router redistribute kernel Set passive interfaces passive-interface eth0
CPE4	Start OSPF ospf start Set router-id ospf config router router-id 192.168.0.4 Start OSPF on interfaces ospf config router network 10.10.40.0/24 area 0.0.0.4 network 172.16.4.0/30 area 0.0.0.4 network 192.168.0.4/32 area 0.0.0.4 Set area types ospf config router area 0.0.0.4 stub Redistribute static routes ospf config router redistribute kernel

Command output analyzing

Neighbors list

Description	Let's analyze the neighbors list output. The routers are connected by the MINT network, but each wireless connection has its own subnet. Routers CPE2, CPE3 and CPE4 have established a neighborhood relationship only with BS1, which means that a neighborhood relationship can be established only within one area. Routers CPE2, CPE3 and CPE4 are selected as DR, BS1 - BDR, because the BS1 router ID is the lowest.
BS1	OSPF> show neighbor Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL 192.168.0.2 1 Full/DR 00:00:32 172.16.0.2 rf5.0:172.16.0.1 0 0 0 192.168.0.3 1 Full/DR 00:00:34 172.16.3.2 rf5.0:172.16.3.1 0 0 0 192.168.0.4 1 Full/DR 00:00:32 172.16.4.2 rf5.0:172.16.4.1 0 0 0
CPE2	OSPF> show neighbor Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL 192.168.0.1 1 Full/Backup 00:00:32 172.16.0.1 rf5.0:172.16.0.2 0 0 0
CPE3	OSPF> show neighbor Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL 192.168.0.1 1 Full/Backup 00:00:31 172.16.3.1 rf5.0:172.16.3.2 0 0 0
CPE4	OSPF> show neighbor Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL 192.168.0.1 1 Full/Backup 00:00:37 172.16.4.1 rf5.0:172.16.4.2 0 0 0

LSDB content

Description	Let's analyze LSDB. Unlike the scheme with one area, in this example the LSA set for each area will be different. Area 0: LSA type 1 (Router Link States): The LSDB contains two LSA type 1, from each area router. LSA type 2 (Net Link States): CPE2 router as a DR generates one LSA type 2. LSA type 3 (Summary Link States): LSDB contains 6 LSA type 3 about networks in different areas. LSA type 4 (ASBR-Summary Link States): CPE3 router is ASBR and located in area 3, it redistributes static routes, BS1 generates LSA type 4 for area 0 with information about the location of ASBR CPE3. LSA type 5 (AS External Link States): By default, one LSA type 5 is generated for each external route, therefore LSDB contains three LSA type 5 about routes to external networks: routes to networks 192.168.5.0/28 and 192.168.6.0/28 were generated during redistribution of CPE3 static routes, route to network 10.10.10.0/24 is generated by BS1 during redistribution of a directly connected network. Since area 3 is an NSSA, then LSA type 5 about networks 192.168.5.0/28 and 192.168.6.0/28 for area 0 are generated by BS1, and replace LSA type 7 from CPE3. Area 3: LSA type 1 (Router Link States): The LSDB contains two LSA type 1, from each area router. LSA type 2 (Net Link States): CPE3 router as a DR generates one LSA type 2. LSA type 3 (Summary Link States): LSDB contains 7 LSA type 3 about networks in different areas, similar to area 0. The difference is in the LSA with a default route generated by BS1 for area 3. LSA type 5 (AS External Link States): CPE3 router generates 2 LSA type 5 with information about the static routes redistribution. The presence of these LSs in LSDB is formal, since the CPE3 router converts it to LSA type 7 and forwards them to neighbors. LSA type 7 (NSSA-external Link States): external routes in NSSA type areas are transmitted using LSA type 7, so the LSDB includes three LSA of this type. Area 4: LSA type 1 (Router Link States): The LSDB contains two LSA type 1, from each area router. LSA type 2 (Net Link States): CPE4 router as a DR generates one LSA type 2. LSA type 3 (Summary Link States): LSDB contains 7 LSA type 3 about networks in different areas and one LSA type 3, with default route. Stub areas do not support routes to external networks distribution, which are replaced by the default route distribution in LSA type 3. Note, routers CPE2, CPE3, and CPE4 use only LSA generated for areas 0, 3, and 4. BS1 LSDB includes LSA for all areas, since BS1 is ABR and is set at the border of three areas.
BS1	OSPF> show database OSPF Router with ID (192.168.0.1)(192.168.0.1) Router Link States (Area 0.0.0.0) Link ID ADV Router Age Seq# LS-Age Link count 192.168.0.1 192.168.0.1 235 0x80000003 246 2 192.168.0.2 192.168.0.2 232 0x80000005 243 3 Net Link States (Area 0.0.0.0) Link ID ADV Router Age Seq# LS-Age Routers 172.16.0.2/30 192.168.0.2 244 0x80000001 243 2 Summary Link States (Area 0.0.0.0) Link ID ADV Router Age Seq# LS-Age Route 10.10.30.0 192.168.0.1 237 0x80000001 237 10.10.30.0/24 10.10.40.0 192.168.0.1 237 0x80000001 237 10.10.40.0/24 172.16.3.0 192.168.0.1 245 0x80000001 245 172.16.3.0/30 172.16.4.0 192.168.0.1 245 0x80000001 245 172.16.4.0/30 192.168.0.3 192.168.0.1 237 0x80000001 237 192.168.0.3/32 192.168.0.4 192.168.0.1 237 0x80000001 237 192.168.0.4/32 ASBR-Summary Link States (Area 0.0.0.0) Link ID ADV Router Age Seq# LS-Age 192.168.0.3 192.168.0.1 237 0x80000001 237 Router Link States (Area 0.0.0.3 [NSSA]) Link ID ADV Router Age Seq# LS-Age Link count 192.168.0.1 192.168.0.1 236 0x80000003 246 1 192.168.0.3 192.168.0.3 224 0x80000005 243 3 Net Link States (Area 0.0.0.3 [NSSA]) Link ID ADV Router Age Seq# LS-Age Routers 172.16.3.2/30 192.168.0.3 244 0x80000001 243 2 Summary Link States (Area 0.0.0.3 [NSSA]) Link ID ADV Router Age Seq# LS-Age Route 0.0.0.0 192.168.0.1 245 0x80000001 245 0.0.0.0/0 10.10.20.0 192.168.0.1 237 0x80000001 237 10.10.20.0/24 10.10.40.0 192.168.0.1 237 0x80000001 237 10.10.40.0/24 172.16.0.0 192.168.0.1 245 0x80000001 245 172.16.0.0/30 172.16.4.0 192.168.0.1 245 0x80000001 245 172.16.4.0/30 192.168.0.1 192.168.0.1 240 0x80000001 240 192.168.0.1/32 192.168.0.2 192.168.0.1 237 0x80000001 237 192.168.0.2/32 192.168.0.4 192.168.0.1 237 0x80000001 237 192.168.0.4/32 NSSA-external Link States (Area 0.0.0.3 [NSSA]) Link ID ADV Router Age Seq# LS-Age Route 10.10.10.0 192.168.0.1 243 0x80000004 246 E2 10.10.10.0/24 [0x0] 192.168.5.0 192.168.0.3 244 0x80000002 243 E2 192.168.5.0/28 [0x0] 192.168.6.0 192.168.0.3 244 0x80000002 243 E2 192.168.6.0/28 [0x0] Router Link States (Area 0.0.0.4 [Stub]) Link ID ADV Router Age Seq# LS-Age Link count 192.168.0.1 192.168.0.1 231 0x80000003 246 1 192.168.0.4 192.168.0.4 215 0x80000005 243 3 Net Link States (Area 0.0.0.4 [Stub]) Link ID ADV Router Age Seq# LS-Age Routers 172.16.4.2/30 192.168.0.4 244 0x80000001 243 2 Summary Link States (Area 0.0.0.4 [Stub]) Link ID ADV Router Age Seq# LS-Age Route 0.0.0.0 192.168.0.1 245 0x80000001 245 0.0.0.0/0 10.10.20.0 192.168.0.1 237 0x80000001 237 10.10.20.0/24 10.10.30.0 192.168.0.1 237 0x80000001 237 10.10.30.0/24 172.16.0.0 192.168.0.1 245 0x80000001 245 172.16.0.0/30 172.16.3.0 192.168.0.1 245 0x80000001 245 172.16.3.0/30 192.168.0.1 192.168.0.1 240 0x80000001 240 192.168.0.1/32 192.168.0.2 192.168.0.1 237 0x80000001 237 192.168.0.2/32 192.168.0.3 192.168.0.1 237 0x80000001 237 192.168.0.3/32 AS External Link States Link ID ADV Router Age Seq# LS-Age Route 10.10.10.0 192.168.0.1 243 0x80000004 246 E2 10.10.10.0/24 [0x0] 192.168.5.0 192.168.0.1 207 0x80000002 239 E2 192.168.5.0/28 [0x0] 192.168.6.0 192.168.0.1 207 0x80000002 239 E2 192.168.6.0/28 [0x0]
CPE2	OSPF> show database OSPF Router with ID (192.168.0.2)(192.168.0.2) Router Link States (Area 0.0.0.0) Link ID ADV Router Age Seq# LS-Age Link count 192.168.0.1 192.168.0.1 61 0x80000003 68 2 192.168.0.2 192.168.0.2 56 0x80000005 96 3 Net Link States (Area 0.0.0.0) Link ID ADV Router Age Seq# LS-Age Routers 172.16.0.2/30 192.168.0.2 68 0x80000001 68 2 Summary Link States (Area 0.0.0.0) Link ID ADV Router Age Seq# LS-Age Route 10.10.30.0 192.168.0.1 63 0x80000001 62 10.10.30.0/24 10.10.40.0 192.168.0.1 63 0x80000001 62 10.10.40.0/24 172.16.3.0 192.168.0.1 71 0x80000001 68 172.16.3.0/30 172.16.4.0 192.168.0.1 71 0x80000001 68 172.16.4.0/30 192.168.0.3 192.168.0.1 63 0x80000001 62 192.168.0.3/32 192.168.0.4 192.168.0.1 63 0x80000001 62 192.168.0.4/32 ASBR-Summary Link States (Area 0.0.0.0) Link ID ADV Router Age Seq# LS-Age 192.168.0.3 192.168.0.1 63 0x80000001 62 AS External Link States Link ID ADV Router Age Seq# LS-Age Route 10.10.10.0 192.168.0.1 69 0x80000004 68 E2 10.10.10.0/24 [0x0] 192.168.5.0 192.168.0.1 65 0x80000002 64 E2 192.168.5.0/28 [0x0] 192.168.6.0 192.168.0.1 65 0x80000002 64 E2 192.168.6.0/28 [0x0]
CPE3	OSPF> show database OSPF Router with ID (192.168.0.3)(192.168.0.3) Router Link States (Area 0.0.0.3 [NSSA]) Link ID ADV Router Age Seq# LS-Age Link count 192.168.0.1 192.168.0.1 157 0x80000003 163 1 192.168.0.3 192.168.0.3 142 0x80000005 182 3 Net Link States (Area 0.0.0.3 [NSSA]) Link ID ADV Router Age Seq# LS-Age Routers 172.16.3.2/30 192.168.0.3 163 0x80000001 163 2 Summary Link States (Area 0.0.0.3 [NSSA]) Link ID ADV Router Age Seq# LS-Age Route 0.0.0.0 192.168.0.1 166 0x80000001 163 0.0.0.0/0 10.10.20.0 192.168.0.1 158 0x80000001 157 10.10.20.0/24 10.10.40.0 192.168.0.1 158 0x80000001 157 10.10.40.0/24 172.16.0.0 192.168.0.1 166 0x80000001 163 172.16.0.0/30 172.16.4.0 192.168.0.1 166 0x80000001 163 172.16.4.0/30 192.168.0.1 192.168.0.1 161 0x80000001 160 192.168.0.1/32 192.168.0.2 192.168.0.1 158 0x80000001 157 192.168.0.2/32 192.168.0.4 192.168.0.1 158 0x80000001 157 192.168.0.4/32 NSSA-external Link States (Area 0.0.0.3 [NSSA]) Link ID ADV Router Age Seq# LS-Age Route 10.10.10.0 192.168.0.1 164 0x80000004 163 E2 10.10.10.0/24 [0x0] 192.168.5.0 192.168.0.3 163 0x80000002 182 E2 192.168.5.0/28 [0x0] 192.168.6.0 192.168.0.3 163 0x80000002 182 E2 192.168.6.0/28 [0x0] AS External Link States Link ID ADV Router Age Seq# LS-Age Route 192.168.5.0 192.168.0.3 163 0x80000002 182 E2 192.168.5.0/28 [0x0] 192.168.6.0 192.168.0.3 163 0x80000002 182 E2 192.168.6.0/28 [0x0]
CPE4	OSPF> show database OSPF Router with ID (192.168.0.4)(192.168.0.4) Router Link States (Area 0.0.0.4 [Stub]) Link ID ADV Router Age Seq# LS-Age Link count 192.168.0.1 192.168.0.1 194 0x80000003 205 1 192.168.0.4 192.168.0.4 176 0x80000005 216 3 Net Link States (Area 0.0.0.4 [Stub]) Link ID ADV Router Age Seq# LS-Age Routers 172.16.4.2/30 192.168.0.4 205 0x80000001 205 2 Summary Link States (Area 0.0.0.4 [Stub]) Link ID ADV Router Age Seq# LS-Age Route 0.0.0.0 192.168.0.1 208 0x80000001 205 0.0.0.0/0 10.10.20.0 192.168.0.1 200 0x80000001 199 10.10.20.0/24 10.10.30.0 192.168.0.1 200 0x80000001 199 10.10.30.0/24 172.16.0.0 192.168.0.1 208 0x80000001 205 172.16.0.0/30 172.16.3.0 192.168.0.1 208 0x80000001 205 172.16.3.0/30 192.168.0.1 192.168.0.1 203 0x80000001 202 192.168.0.1/32 192.168.0.2 192.168.0.1 200 0x80000001 199 192.168.0.2/32 192.168.0.3 192.168.0.1 200 0x80000001 199 192.168.0.3/32

Routing table

Description	The routing tables of wireless devices, contains entries that each device has information about each subnet shown in the scheme. This means that the devices have successfully exchanged routing information and added it to the FIB. The main difference between devices routing tables is routes to external networks: on some routers there is a direct route to the network, and on the others a default route. Note, the loopback interfaces addresses do not depend on the links state, therefore they can be used to manage devices in redundant networks.
BS1	BS_1#1> netstat -r Routing tables Destination Gateway Flags Refs Use Interface 10.10.10.0/24 link#2 UC 0 0 eth0 10.10.20.0/24 172.16.0.2 UG3 0 0 rf5.0 10.10.30.0/24 172.16.3.2 UG3 0 0 rf5.0 10.10.40.0/24 172.16.4.2 UG3 0 0 rf5.0 127.0.0.1 127.0.0.1 UH 3 465 lo0 172.16.0.0/30 link#3 UC 0 0 rf5.0 172.16.3.0/30 link#3 UC 0 0 rf5.0 172.16.4.0/30 link#3 UC 0 0 rf5.0 192.168.0.1 192.168.0.1 UH 0 0 lo0 192.168.0.2 172.16.0.2 UGH3 0 0 rf5.0 192.168.0.3 172.16.3.2 UGH3 0 0 rf5.0 192.168.0.4 172.16.4.2 UGH3 0 0 rf5.0 192.168.5.0/28 172.16.3.2 UG3 0 0 rf5.0 192.168.6.0/28 172.16.3.2 UG3 0 0 rf5.0 224.0.0.0/8 127.0.0.1 UGS 1 11852 lo0
CPE2	AS_2#2> netstat -r Routing tables Destination Gateway Flags Refs Use Interface 10.10.10.0/24 172.16.0.1 UG3 0 0 rf5.0 10.10.20.0/24 link#2 UC 0 0 eth0 10.10.30.0/24 172.16.0.1 UG3 0 0 rf5.0 10.10.40.0/24 172.16.0.1 UG3 0 0 rf5.0 127.0.0.1 127.0.0.1 UH 3 396 lo0 172.16.0.0/30 link#3 UC 0 0 rf5.0 172.16.3.0/30 172.16.0.1 UG3 0 0 rf5.0 172.16.4.0/30 172.16.0.1 UG3 0 0 rf5.0 192.168.0.1 172.16.0.1 UGH3 0 0 rf5.0 192.168.0.2 192.168.0.2 UH 0 0 lo0 192.168.0.3 172.16.0.1 UGH3 0 0 rf5.0 192.168.0.4 172.16.0.1 UGH3 0 0 rf5.0 192.168.5.0/28 172.16.0.1 UG3 0 0 rf5.0 192.168.6.0/28 172.16.0.1 UG3 0 0 rf5.0 224.0.0.0/8 127.0.0.1 UGS 1 15881 lo0
CPE3	AS_3#1> netstat -r Routing tables Destination Gateway Flags Refs Use Interface default 172.16.3.1 UG3 0 0 rf5.0 10.10.10.0/24 172.16.3.1 UG3 0 0 rf5.0 10.10.20.0/24 172.16.3.1 UG3 0 0 rf5.0 10.10.30.0/24 link#2 UC 0 0 eth0 10.10.40.0/24 172.16.3.1 UG3 0 0 rf5.0 127.0.0.1 127.0.0.1 UH 3 534 lo0 172.16.0.0/30 172.16.3.1 UG3 0 0 rf5.0 172.16.3.0/30 link#3 UC 0 0 rf5.0 172.16.4.0/30 172.16.3.1 UG3 0 0 rf5.0 192.168.0.1 172.16.3.1 UGH3 0 0 rf5.0 192.168.0.2 172.16.3.1 UGH3 0 0 rf5.0 192.168.0.3 192.168.0.3 UH 0 0 lo0 192.168.0.4 172.16.3.1 UGH3 0 0 rf5.0 192.168.5.0/28 10.10.30.1 UGS 0 0 eth0 192.168.6.0/28 10.10.30.1 UGS 0 0 eth0 224.0.0.0/8 127.0.0.1 UGS 1 9339 lo0
CPE4	AS_4#1> netstat -r Routing tables Destination Gateway Flags Refs Use Interface default 172.16.4.1 UG3 0 0 rf5.0 10.10.20.0/24 172.16.4.1 UG3 0 0 rf5.0 10.10.30.0/24 172.16.4.1 UG3 0 0 rf5.0 10.10.40.0/24 link#2 UC 0 0 eth0 127.0.0.1 127.0.0.1 UH 3 271 lo0 172.16.0.0/30 172.16.4.1 UG3 0 0 rf5.0 172.16.3.0/30 172.16.4.1 UG3 0 0 rf5.0 172.16.4.0/30 link#3 UC 0 0 rf5.0 192.168.0.1 172.16.4.1 UGH3 0 0 rf5.0 192.168.0.2 172.16.4.1 UGH3 0 0 rf5.0 192.168.0.3 172.16.4.1 UGH3 0 0 rf5.0 192.168.0.4 192.168.0.4 UH 0 0 lo0 224.0.0.0/8 127.0.0.1 UGS 1 3138 lo0

Additional materials

Webinars

Typical scenario of routing setting using Infinet Wireless devices. Part II

Page tree

OSPF protocol configuration

Table of content

Description

Network scheme with one OSPF area

Pre-configuration

OSPF configuration

Command output analyzing

Neighbors list

LSDB content

Routing table

Scheme with several areas

Pre-configuration

OSPF configuration

Command output analyzing

Neighbors list

LSDB content

Routing table

Additional materials

Webinars

Other