Announce test prefix for BGP session - Expressroute setup

virtuali1151
virtuali1151 used Ask the Experts™
on
Hello,

I am trying to announce a test prefix via BGP to test a new expressroute circuit we have setup.  I have a cisco 3850 layer switch and I would like to know the commands needed to setup this test prefix so I can do it without disrupting our current traffic. Tks in advance.

peer_asn                      = 650XX
primary_peer_address_prefix   = "172.16.0.0/30"
secondary_peer_address_prefix = "172.16.0.4/30"
vlan_id                       = 150
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SouljaSr.Net.Eng
Top Expert 2011

Commented:
Do you currently have an active bgp peering with the  BGP peer above?

Author

Commented:
Yes, the Expressroute circuit is up and in "Provisioned Status"
SouljaSr.Net.Eng
Top Expert 2011

Commented:
A simple network statement under your bgp process with the prefix you want to advertise to the express router neighbor. If you have an outbound prefix list you'd need to include the prefix in that as well.
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SouljaSr.Net.Eng
Top Expert 2011

Commented:
BTW, if the prefix that you want to advertise isn't in your router's routing table, you will need to add a static null route of that prefix on your router.

Author

Commented:
Do you have an example of what that would look like? Im not very familiar with BGP.. Im using a cisco 3850..
SouljaSr.Net.Eng
Top Expert 2011

Commented:
Just high level example. Could require more as I don't know your full setup.

router bgp xxx
  neighbor 172.16.0.1 remote-as 650xx
  address-family ipv4
       network x.x.x.x mask 255.255.255.0
 
ip route x.x.x.x 255.255.255.0 Null0  (if no route exists for test prefix on your router)
I was able to figure this out via assistance from Cisco TAC.  There was quite abit more to it for expressroute. Tks u!

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