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. And see here for current known issues.

New Member

BGP as-path prepend using route map and ip prefix-list causing issues


At my location B, I want to advertise Location A subnets but prepend to make less preferred.   

  I start having issues on Location B WAN circuit when apply config


route-map BGP_Filter_Out_MPLS permit 10
 match ip address prefix-list LocationA-Subnet
 set as-path prepend 64512
route-map BGP_Filter_Out_MPLS permit 20
 match ip address prefix-list LocationB-Subnet


router bgp 64512

network mask

network mask

network mask

network mask

neighbor remote-as 55757

neighbor route-map BGP_Filter_Out_MPLS out

ip prefix-list LocationA-Subnet description  subnet(s)
ip prefix-list LocationA-Subnet seq 5 permit

ip prefix-list LocationA-Subnet seq 10 permit


ip prefix-list LocationB-Subnet description  subnet(s)
ip prefix-list LocationB-Subnet seq 5 permit

ip prefix-list LocationB-Subnet seq 10 permit


i am running 12.4(11)T4  on a 2811






Hello, What issues are you

Hello, What issues are you experiencing exactly?

Please rate useful posts & remember to mark any solved questions as answered. Thank you.
New Member

I started dropping packets

I started dropping packets when applied.  My carrier does a ping to my end of the circuit and I tried to ping them.  I was thinking it 75 percent packet loss.   As soon as I removed the  neighbor statement, all returned to normal.