Re: [OSPF] Sham link query

[Peter Psenak <ppsenak at cisco.com>]

Lokesh,

Lokesh Jain wrote:

> Hi All,
> 
> I have a doubt regarding packet (data packets, lsa, hello packets) 
> forwarding on Sham Link.
> 
> On two different PEs, we establish a Sham link between two VRFs. The 
> Sham Link End point Address on each PE is associated with one OSPF 
> instance and advertised by the BGP into the backbone. Is this 
> advertisement done in the same way as for any other route (advertising a 
> VPN label for the route) ?

SL endpoint addresses are addresses that reside in the VRF space and are 
advertised as BGP VPNv4 routes. SL endpoint addresses should not be 
advertised by OSPF itself.

> 
> So on both PEs, the routing entry (BGP) will be stored in corresponding 
> VRF(along with VPN label) along with next hop information (which will be 
> taken from default VRF).

right.

> 
> On this sham link, hello/dd/LSA packets (basically OSPF originated 
> packets) as well as data packets (host originated) will be forwarded. 
> What is the difference in the labels applied by the ingress PE router 
> for both type of packets, if any?

no difference if the 'host originated' above means originated by the PE 
and sent to the SL destination address on remote PE.

Peter

> 
> -- 
> ~~~~~~~~~~~~~
> Thanks & Regards,
> ~~~~~~~~~~~~~
> Lokesh Jain
> Senior Software Engineer,
> Samsung India Software Operations Pvt. Ltd.,
> Bagmane Tech Park, C V Raman Nagar,
> Bangalore.
> Mob: 9880611348
> -----------------------------------------------------
> You always miss 100% of the chances u don't take
> 
> 
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