From: Ramya S (ramya_1975@hotmail.com)
Date: Mon Jun 25 2007 - 08:11:11 ART
Hi all,In the book Cisco_Press_MPLS_Configuration_on_Cisco_IOS_Software of
ciscopress I came across an interesting scenario present in chapter 14
called"Implementing Hub and Spoke Topologies with OSPF".Here the author has
implemented mpls vpn for ospf hub and spoke topology. 2spokes are pumping E2
routes and the other spoke also sending some routeswhile it is in the same
area as the hub site.2 links in different vrfs (vrf 1 -2hub, vrf 2 - 2spoke)
are present for thehub site so that all traffic can traverse hub site.
Appropriate route targetsare configured.The author has overcome the down bit
problem by implementing Shamlinks betweenthe hub and spoke site which are in
the same area, due to which routepropagation takes place to other spokes.For
the remaining spokes which are sending E2 routes, the author had changedthe
domain tag for the routes as it goes to the hub site (vrf1- 2hub) and
whenthese routes are sent to the other pe-ce link of the hub site, the routes
arepropagated since the domain tag is not matching.My question is, instead of
implementing shamlinks or changing the domain tagvalue. Can we use the ospf
command that relaxes the routing loop check ie
"capability vrf-lite" in the other ospf vrf process (vrf2- 2sopke)
topropagate the routes and implement the ospf hub and spoke?Regards,Ramya
Sen.
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