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Regarding BGP prefixes

virendrapathak1
Level 1
Level 1

hello All,

 

I have created lab and was doing preparation of BGP lab. Lab Scenario is attached herewith.

I just do the simple configuration of BGP, for three router's i used iBGP and other router's are connected via eBGP. 

I checked and found that every prfixes are advertised in every AS but when i was doing the ping, then prefixes are not reachable.

Only from iBGP to eBGP, advertised prefixes were reachable.

eg: AS1 prefixes are updated in AS2>AS3>AS4>AS5 AND vice-versa. 

 

When i do the sh ip route to any prefixes, then it display, no subnet in Route table. When i do sh ip bgp, i must see that prefixes are advertised in BGP.

 

Please correct me for the same. My question is that Do i need to do routing for other AS to update Prefixes in router's rout table.

1 Reply 1

milan.kulik
Level 10
Level 10

Hi,

 

your lab scenario is missing here.

So just guessing:

Possibly you need to configure

neighbor... next-hop-self

for your iBGP neighbors on the router peering by eBGP to the other AS?

Without that the other iBGP peers might not be able to reach the other AS.

 

Best regards,

Milan