Hello everyone,
I am trying to get AS-Path prepending to work on my switch in my network but it isn't prepending the AS as it should be doing per the route-map. This is all within my home lab that I am also using to connect to the internet. I am peering with my two upstream routers and sending down a default route from both of those. The routes that you see with my own AS being prepended is the upstream router doing that. As an example Router A (172.16.1.1) shows the AS being prepended 5 times.
Here is my configuration:
show run | s route-map
route-map Failover permit 10
set metric 15000
set as-path prepend 64512 64512 64512 64512 64512 64512 64512 64512
route-map Primary permit 10
set metric 5000
set as-path prepend 64512 64512 64512 64512 64512
route-map Secondary permit 10
set metric 10000
set as-path prepend 64512 64512 64512 64512 64512 64512
show run | section bgp
router bgp 64512
bgp log-neighbor-changes
network 10.10.10.0 mask 255.255.255.0
network 10.40.20.0 mask 255.255.255.0
network 172.16.1.0 mask 255.255.255.252
network 172.16.1.4 mask 255.255.255.252
network 172.16.1.8 mask 255.255.255.252
network 172.16.10.0 mask 255.255.255.0
network 172.16.20.0 mask 255.255.255.0
network 172.16.30.0 mask 255.255.255.0
network 172.16.75.0 mask 255.255.255.0
network 172.16.100.0 mask 255.255.255.0
neighbor IBGP peer-group
neighbor IBGP remote-as 64512
neighbor IBGP route-reflector-client
neighbor IBGP next-hop-self
neighbor IBGP soft-reconfiguration inbound
neighbor Cox peer-group
neighbor Cox remote-as 64512
neighbor Cox route-reflector-client
neighbor Cox next-hop-self
neighbor Cox soft-reconfiguration inbound
neighbor Cox route-map Primary in
neighbor Cox route-map Primary out
neighbor CenturyLink peer-group
neighbor CenturyLink remote-as 64512
neighbor CenturyLink route-reflector-client
neighbor CenturyLink next-hop-self
neighbor CenturyLink soft-reconfiguration inbound
neighbor CenturyLink route-map Secondary in
neighbor CenturyLink route-map Secondary out
neighbor 172.16.1.1 peer-group Cox
neighbor 172.16.1.1 fall-over bfd
neighbor 172.16.1.5 peer-group CenturyLink
neighbor 172.16.20.210 peer-group IBGP
neighbor 172.16.30.5 peer-group IBGP
show ip bgp:
Network Next Hop Metric LocPrf Weight Path
*>i 0.0.0.0 172.16.1.1 5000 100 0 i
* i 172.16.1.5 10000 100 0 i
*>i 10.1.2.0/30 172.16.1.1 5000 100 0 64512 64512 64512 64512 64512 64512 65535 i
*>i 10.2.2.0/30 172.16.1.1 5000 100 0 i
* i 172.16.1.5 10000 100 0 i
*> 10.10.10.0/24 0.0.0.0 0 32768 i
*> 10.40.20.0/24 0.0.0.0 0 32768 i
*>i 10.200.1.1/32 172.16.1.1 5000 100 0 64512 64512 64512 64512 64512 64512 65535 i
*>i 10.200.1.2/32 172.16.1.1 5000 100 0 64512 64512 64512 64512 64512 64512 65535 i
*>i 10.200.1.3/32 172.16.1.1 5000 100 0 i
*>i 10.200.1.4/32 172.16.1.5 10000 100 0 i
Network Next Hop Metric LocPrf Weight Path
*>i 10.200.1.9/32 172.16.20.210 0 100 0 i
*>i 10.200.1.10/32 172.16.30.5 0 100 0 64513 i
*>i 10.200.1.11/32 172.16.30.5 0 100 0 64513 i
*> 172.16.1.0/30 0.0.0.0 0 32768 i
* i 172.16.1.1 5000 100 0 i
*> 172.16.1.4/30 0.0.0.0 0 32768 i
* i 172.16.1.5 10000 100 0 i
*>i 172.16.3.0/25 172.16.30.5 0 100 0 64513 i
*> 172.16.10.0/24 0.0.0.0 0 32768 i
* i 172.16.20.0/24 172.16.20.210 0 100 0 i
*> 0.0.0.0 0 32768 i
* i 172.16.30.0/24 172.16.30.5 0 100 0 i
*> 0.0.0.0 0 32768 i
*> 172.16.75.0/24 0.0.0.0 0 32768 i
*> 172.16.100.0/24 0.0.0.0 0 32768 i
*>i 172.16.130.0/28 172.16.30.5 0 100 0 i
*>i 192.168.0.0 172.16.1.1 5000 100 0 i
* i 172.16.1.5 10000 100 0 i
*>i 192.168.8.0/23 172.16.1.1 5000 100 0 i
