MPLS LAB - PE to CE routing - EIGRP (different AS PE-CE)
January 14th, 2009 in CCIE SP | tags: ,

Now that we’ve seen EIGRP as PE to CE routing protocol with the same AS being used between the PE and CE at different VPN sites I will configure EIGRP between the PE and CE but this time with AS number 21047 between router R6 and router R11 and AS number 21048 between router R3 and router R7.

The config will be the same as in the previous post only the config for router R3 and R7 is changed somewhat, see below the config on router R3 and router R7.

MPLS

Router R3’s config :

R3 :


router eigrp 21047
 no auto-summary
 !
 address-family ipv4 vrf VPN_A
 redistribute bgp 100 metric 10000 1 255 1 1500
 network 37.37.37.3 0.0.0.0
 no auto-summary
 autonomous-system 21048
 exit-address-family
!
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 eigrp 21048
 no auto-summary
 no synchronization
 exit-address-family

Router R7’s config :

R7 :


router eigrp 21048
 redistribute connected metric 10000 1 255 1 1500 route-map LO1
 network 7.7.7.7 0.0.0.0
 network 37.37.37.7 0.0.0.0
 no auto-summary

And the “show ip route” on router R11 :

R11 :


R11#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
D EX    37.37.37.0 [170/258816] via 61.61.61.6, 00:13:10, FastEthernet2/0
     7.0.0.0/32 is subnetted, 1 subnets
D EX    7.7.7.7 [170/258816] via 61.61.61.6, 00:11:40, FastEthernet2/0
     77.0.0.0/32 is subnetted, 1 subnets
D EX    77.77.77.77 [170/258816] via 61.61.61.6, 00:11:40, FastEthernet2/0
     11.0.0.0/32 is subnetted, 1 subnets
C       11.11.11.11 is directly connected, Loopback0
     61.0.0.0/24 is subnetted, 1 subnets
C       61.61.61.0 is directly connected, FastEthernet2/0

As you can see above all routes now show up as external routes in the router R11’s routing table because of the different AS numbers used.

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