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BGP MPLS VPN and peering question

carl_townshend
Spotlight
Spotlight

Hi All

Just a quick question around ISP's and BGP VPNs etc

 

First, If I am one of many customers on an ISPs network, they will assign me into a VRF, I believe all my sites will be the same VRF.

Do all the PE routers peer with each other in the ISP network, or do they just peer with the core nodes etc?

 

Why is it beneficial to run MPBGP with MPLS? why do the 2 go hand in hand? Does the MPLS label stay the same no matter what VRF the traffic is from when traversing the backbone etc?

 

When peering with BGP, do you normally put the same neighbour in both the main bgp config at the start as well as under each address family if peering to the same peer

 

Also is there a way to see what community is being exported by bgp ?

 

router bgp 65000
bgp log-neighbor-changes
no bgp default ipv4-unicast
timers bgp 0 0
neighbor 10.0.0.2 remote-as 65000
neighbor 10.0.0.2 update-source Loopback0
!
address-family ipv4
exit-address-family
!
address-family vpnv4
  neighbor 10.0.0.2 activate
  neighbor 10.0.0.2 send-community both
exit-address-family

1 Reply 1

Jaderson Pessoa
VIP Alumni
VIP Alumni
Hello,

Normally VRF are inputted just on PE routers to differentiate the customers.

show ip bgp neighbor 1.1.1.1
show ip bgp community
Look these others exemple: https://www.cisco.com/c/m/en_us/techdoc/dc/reference/cli/n5k/commands/show-ip-bgp-community.html
Jaderson Pessoa
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