I've got two data centre sites. Each site has is connected by the same ISP, and BGP is is setup between the ISP and eash site:
The diagram looks like this:
The problem I have is when I do a traceroute from the external router in site1 (router1) to the external router in site2(2), the traceroute shows one hop, as though they are directly connected.
How is that possible, shouldn't the traceorute show the route through the ISP's router aswell.
In my router I have the following config:
router bgp dddd
network vvv.vvv.vvv.0 mask 255.255.255.252
network xxx.xxx.xxx.0 mask 255.255.255.224
network zzz.zzz.zzz.96 mask 255.255.255.224
neighbor vvv.vvv.vvv.1 remote-as nnnn
neighbor vvv.vvv.vvv.1 soft-reconfiguration inbound
neighbor vvv.vvv.vvv.1 route-map isp-to-se in
neighbor vvv.vvv.vvv.1 route-map se-to-isp out
neighbor xxx.xxx.xxx.2 remote-as dddd
neighbor xxx.xxx.xxx.2 soft-reconfiguration inbound
ip prefix-list se-src seq 10 permit xxx.xxx.xxx.0/27
ip prefix-list se-src seq 11 permit zzz.zzz.zzz.96/27
route-map se-to-isp permit 10
match ip address prefix-list se-src
set metric 300
route-map isp-to-se permit 10
set metric 20
Does the above play some part in hiding the actual traceroute? How does BGP play a part in this?