Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

BGP WAN Routing

I am still having some difficulty with a bgp configuration. I have a single router with two SPs. The SPs want to ping their respective interfaces. Echoes appear to work from some Internet locations to one interface, and from other locations to the other interface. For instance, Verizon can ping my router (their interface) from the directly connected router, but not from anywhere else. I can ping the Verizon interface on my router from my Comcast account (on the Internet), but I can't ping my other serial interface (ATT).

I have two default routes ( configured on my router and they both show up in the output of sh ip bgp with an "r" (RIB-failure). I'm wondering if this is causing me an issue. When I removed the Verizon default route statement we lost Internet connectivity.

Here is a partial config:

interface Serial0/0

description ATT

bandwidth 1536

ip address

no ip unreachables

encapsulation ppp

service-module t1 timeslots 1-24

interface Serial0/1.100 point-to-point

description Verizon

bandwidth 1536

ip address

no ip unreachables

no cdp enable

frame-relay interface-dlci 100 IETF

router bgp 31818

no synchronization

bgp log-neighbor-changes

network mask

timers bgp 30 90

neighbor remote-as 7018

neighbor description ATT Peering

neighbor soft-reconfiguration inbound

neighbor route-map ATT_only in

neighbor route-map localonly out

neighbor remote-as 6995

neighbor description Verizon Peering

neighbor soft-reconfiguration inbound

neighbor route-map Verizon_only in

neighbor route-map localonly out

no auto-summary


ip classless

ip route

ip route


ip as-path access-list 10 permit ^$

ip as-path access-list 20 permit ^1010$

ip as-path access-list 30 permit ^2020$

route-map ATT_only permit 10

match as-path 20


route-map Verizon_only permit 10

match as-path 30


route-map localonly permit 10

match as-path 10

Any suggestions would be appreciated.



Cisco Employee

Re: BGP WAN Routing

Most providers will include a default route in their BGP advertisement if you request partial routing table. You shouldn't need to have default static routes configured on your side. This is the reason you are seeing the RIB-Failure message, BGP being unable to install the 0/0 in the RIB given that the static routes ares already installed with a lesser AD.

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600