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Ask the Expert- SD-WAN


Pings not going past BGP router

Hi there. I'm having a problem with the setup pictured. In AS 3, all of the routers are able to ping the routers in AS 89 and AS 140. However, the routers in AS 89 and AS 140 cannot ping past R1 and R5 respectively. Each router has a route to the destination in its routing table, all OSPF areas are configured as standard, and there are no routing loops that I can see. R1 and R5 are redistributing OSPF internal and external 2 routes to their BGP partners. R1 is an eBGP neighbor to R6 and R5 is an eBGP neighbor to R8.R1 Routing Table.pngR1 Routing TableR2 Routing Table.pngR2 Routing TableR5 Routing Table.pngR5 Routing TableR6 Routing Table.pngR6 Routing Table

Everyone's tags (3)
VIP Advisor

Re: Pings not going past BGP router


Can you share show ip route from R6 and R8 ?





-If I helped you somehow, please, rate it as useful.-

Re: Pings not going past BGP router

I've included the routing tables of all the routers along the transit line. Here is the output of show ip route on R6


R6#show ip route

Routing entry for

Known via "bgp 89", distance 20, metric 0

Tag 3, type external

Redistributing via ospf 1

Advertised by ospf 1 subnets

Last update from 00:20:44 ago

Routing Descriptor Blocks:

*, from, 00:20:44 ago

Route metric is 0, traffic share count is 1

AS Hops 2

Route tag 3

Re: Pings not going past BGP router

Okay, so I found a workaround. Turns out that redistributing BGP routes into an IGP is, in technical terms, stupid. Rather just do a full iBGP mesh. I still have no idea why this setup doesn't work though.

VIP Collaborator

Re: Pings not going past BGP router

So if you try to ping from R6 past R1, the pings probably fail since it is probably using the as the source. If you source ping from R6 using as source it will probably succeed.

The same holds true for R8 and it using the as the source.

Hope this makes sense and helps.

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