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What basis we have to construct NHAF for IBGP and EBGP?

2008-11-21 23:09:31
Hi 

I am Venkateshwaran(Venkat in short) from Chennai, India.

Please clarify my doubt in BGP4+ how next hop field is constructed?

Setup
=====
Three routers RT1 , RT2 and RT3.
RT1 and RT2 are in same AS 100.  RT3 is different AS 200.
RT1 and RT3 is connected with RT2.

Under this setup i need to clarify the following:

1.  How the next hop field is going to be constructed for MP_REACH_NLRI 
attribute?

   I simulated the same scenario against cisco and zebra.  

   Cisco sends ipv6 global address alone to RT1. To RT3 it sends both ipv6 
global address and link local address.

   Zebra sends both ipv6 global address and link local address to RT1 and RT3.

    Why this different behavior?  Kindly Please clarify me in what basis we 
have to construct NHAF for IBGP and EBGP?

Regards
Venkat





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