From: Raj Bahad (raj.bahad@xxxxxxxxxxxxxx)
Date: Tue Jul 30 2002 - 14:12:02 GMT-3
Hi all,
R2--------R1--------R3
R2 & R1 are in the same AS running IBGP with synchronization disabled. R1 to
R3 are running EBGP.
>> I'm having trouble with the following scenario:
>
>>
>> R1 & R2 are in the same AS (100) and R3 is in AS 300. Essentially, when I
>> include the link between R1 - R3 in the IGP, R2 has no problems reaching
>> all
>> networks on R3. However, if I remove this option and use a "next hop self"
>> command pointing to R2, this also is fine. The problem is when R3 tries to
>> ping networks on R2...because R2 does not know of the link (192.168.0.0)
>> network via its IGP, it is unable to reply to pings. This is because the
>> packet leaving R3 has its serial interface (192.168.0.0) as the source
>> address. Using extended pings (specifying loopback as source) R3 has full
>> reachability with R1.
>>
>> Is there a way I can get R2 to respond to pings coming from R3 (serial
>> interface), without R1 including the R1 - R3 subnet in its IGP?
>>
>> The config for all three routers has been listed below:
>>
>> R1#sh run
>>
>> hostname R1
>> !
>> interface Loopback0
>> ip address 10.10.10.1 255.255.255.255
>> !
>> interface Ethernet0
>> no ip address
>> !
>> interface Serial0
>> ip address 172.16.20.1 255.255.255.252
>> clockrate 125000
>> !
>> interface Serial1
>> ip address 192.168.10.1 255.255.255.252
>> clockrate 125000
>> !
>> interface BRI0
>> no ip address
>> shutdown
>> !
>> router eigrp 10
>> passive-interface Serial1
>> network 10.0.0.0
>> network 172.16.0.0
>> no auto-summary
>> no eigrp log-neighbor-changes
>> !
>> router bgp 100
>> no synchronization
>> bgp log-neighbor-changes
>> network 10.10.10.1 mask 255.255.255.255
>> network 172.16.20.0 mask 255.255.255.252
>> neighbor 10.10.10.2 remote-as 100
>> neighbor 10.10.10.2 update-source Loopback0
>> neighbor 10.10.10.2 next-hop-self
>> neighbor 192.168.10.2 remote-as 300
>> !
>>
>> R2#sh run
>> Building configuration...
>> !
>> hostname R2
>> !
>> interface Loopback0
>> ip address 10.10.10.2 255.255.255.255
>> !
>> interface Ethernet0
>> no ip address
>> !
>> interface Serial0
>> ip address 172.16.20.2 255.255.255.252
>> no ip mroute-cache
>> !
>> interface Serial1
>> no ip address
>> shutdown
>> !
>> interface BRI0
>> no ip address
>> shutdown
>> !
>> router eigrp 10
>> network 10.0.0.0
>> network 172.16.0.0
>> no auto-summary
>> no eigrp log-neighbor-changes
>> !
>> router bgp 100
>> no synchronization
>> bgp log-neighbor-changes
>> network 10.10.10.2 mask 255.255.255.255
>> neighbor 10.10.10.1 remote-as 100
>> neighbor 10.10.10.1 update-source Loopback0
>> !
>> ip classless
>>
>> R3#sh run
>> Building configuration...
>> !
>> hostname R3
>> !
>> interface Loopback0
>> ip address 10.10.10.3 255.255.255.255
>> !
>> interface Loopback1
>> ip address 123.123.123.123 255.255.255.0
>> !
>> interface Loopback2
>> ip address 111.111.1.111 255.255.255.0 secondary
>> ip address 111.111.2.111 255.255.255.0 secondary
>> ip address 111.111.3.111 255.255.255.0 secondary
>> ip address 111.111.4.111 255.255.255.0 secondary
>> ip address 111.111.5.111 255.255.255.0 secondary
>> ip address 111.111.6.111 255.255.255.0 secondary
>> ip address 111.111.7.111 255.255.255.0 secondary
>> ip address 111.111.8.111 255.255.255.0 secondary
>> ip address 111.111.9.111 255.255.255.0 secondary
>> ip address 111.111.10.111 255.255.255.0 secondary
>> ip address 111.111.0.111 255.255.255.0
>> !
>> interface Ethernet0
>> no ip address
>> !
>> interface Serial0
>> no ip address
>> no ip mroute-cache
>> shutdown
>> no fair-queue
>> !
>> interface Serial1
>> ip address 192.168.10.2 255.255.255.252
>> !
>> interface BRI0
>> no ip address
>> shutdown
>> !
>> router eigrp 10
>> passive-interface Serial1
>> network 10.0.0.0
>> network 192.168.10.0
>> no auto-summary
>> no eigrp log-neighbor-changes
>> !
>> router bgp 300
>> no synchronization
>> bgp log-neighbor-changes
>> network 10.10.10.3 mask 255.255.255.255
>> network 111.111.0.0 mask 255.255.255.0
>> network 111.111.1.0 mask 255.255.255.0
>> network 111.111.2.0 mask 255.255.255.0
>> network 111.111.3.0 mask 255.255.255.0
>> network 111.111.4.0 mask 255.255.255.0
>> network 111.111.5.0 mask 255.255.255.0
>> network 111.111.6.0 mask 255.255.255.0
>> network 111.111.7.0 mask 255.255.255.0
>> network 111.111.8.0 mask 255.255.255.0
>> network 111.111.9.0 mask 255.255.255.0
>> network 111.111.10.0 mask 255.255.255.0
>> network 123.123.123.0 mask 255.255.255.0
>> neighbor 192.168.10.1 remote-as 100
>> no auto-summary
>> !
>> ip classless
>>
>> Regards,
>>
>> Raj.
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