[c-nsp] MPLS 2 Hub sites with loadsharing, same or separate AS numbers?

Roger Wiklund copse at xy.org
Wed Sep 2 13:01:20 EDT 2009


I have a question regarding AS numbers, whats the best solution, and
pros/cons with the different setups?

Let say there is an MPLS provider, and one customer has a HUB-site with dual
CPE in the VPN. Each CE router is connected to 2 different PE routers.
Behind each CE router the customer has a Juniper router and are using eBGP
to peer with us.

They want per session loadsharing between the to CPEs. The MPLS provider are
not planning to run iBGP between the CE routers. Only eBGP to the PE.

Now, should these 2 CE routers belong the the same AS number? Let say, 100.
Or should they be in separate? 100, and 200?
You should still be able to loadshare with max-path eibgp 2 on the PEs even
if they are in different AS numbers right? It is only the AS path lengt that
is compared, not the actual number if im not misstaken.

Any pros/cons with the different setups, same AS, different AS.


More information about the cisco-nsp mailing list