In this post OSPF will again be the PE to CE routing-protocol. The only difference with the previous post is that the OSPF PID between router R3 and R7 will be 20.
Below the diagram again :
The changes made on router R3 and R7 below :
R3 :
router ospf 20 vrf VPN_A
router-id 37.37.37.3
log-adjacency-changes
redistribute bgp 100 subnets
network 37.37.37.3 0.0.0.0 area 0
!
router bgp 100
no synchronization
bgp router-id 3.3.3.3
bgp log-neighbor-changes
neighbor 6.6.6.6 remote-as 100
neighbor 6.6.6.6 update-source Loopback0
no auto-summary
!
address-family ipv4 vrf VPN_A
redistribute ospf 20 vrf VPN_A match internal external 1 external 2
no auto-summary
no synchronization
exit-address-family
The “show ip route” output on router R7 before changing the PID from 10 (like configured in the previous post) to 20 on router R3 and R7 :
R7 :
R7#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
37.0.0.0/24 is subnetted, 1 subnets
C 37.37.37.0 is directly connected, FastEthernet1/3
7.0.0.0/32 is subnetted, 1 subnets
C 7.7.7.7 is directly connected, Loopback0
11.0.0.0/32 is subnetted, 1 subnets
O E2 11.11.11.11 [110/20] via 37.37.37.3, 00:02:19, FastEthernet1/3
61.0.0.0/24 is subnetted, 1 subnets
O IA 61.61.61.0 [110/2] via 37.37.37.3, 00:02:19, FastEthernet1/3
After changing the PID to 20 the “show ip route” output on router R7 looks like below , notice that now all routes are seen as external routes.
The “show ip route” output on router R7 after changing the PID on router R3 and R7 :
R7 :
R7#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
37.0.0.0/24 is subnetted, 1 subnets
C 37.37.37.0 is directly connected, FastEthernet1/3
7.0.0.0/32 is subnetted, 1 subnets
C 7.7.7.7 is directly connected, Loopback0
11.0.0.0/32 is subnetted, 1 subnets
O E2 11.11.11.11 [110/20] via 37.37.37.3, 00:00:59, FastEthernet1/3
61.0.0.0/24 is subnetted, 1 subnets
O E2 61.61.61.0 [110/1] via 37.37.37.3, 00:00:59, FastEthernet1/3
This can be overcome by chaging domain-id with no downtime. Because by default pid works as domain id. So we need to make the domain-id same and consequence no e2 routes.
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Hi
Good doc , I have posted the same on my blog also.
http://shivlu.blogspot.com/2008/11/why-ospf-vpnv4-routes-look-as-external_07.html
This can be overcome by chaging domain-id with no downtime. Because by default pid works as domain id. So we need to make the domain-id same and consequence no e2 routes.
regards
shivlu jain
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