Hi Jaghori Thanks for you response. Actually R1 and R3 routers are our simulation routers. Simply those routers are responding TCP packets and BGP messages to maintain the session with R2. Our application simulates like BGP router. Here R1 establishes IBGP connection against R2. Similarly R3 establishes EBGP connection against R2. Following commands has been configured on R2. R2#router bgp 100 R2#neighbor R1 remote-as 100 R2#neighbor R3 remote-as 200 R2#address-family ipv6 unicast R2#neighbor R1 activate R2#neighbor R3 activate R2#network 5ffe::/64 Once a TCP connection has established against R1 , R2 has to advertise 5ffe::/64 to R1. Similarly against R3. If R2 is cisco ============== In R1 i am getting UPDATE message with ipv6 global address alone in NHAF. In R3 i am getting UPDATE message with ipv6 global address and link local addres in NHAF. If R2 is zebra ============== In R1 i am getting UPDATE message with ipv6 global address and link local addres in NHAF. In R3 i am getting UPDATE message with ipv6 global address and link local addres in NHAF. Hope you understand my setup. Please clarify if i am wrong. Regards Venkat --- On Sun, 23/11/08, AJ Jaghori <ciscoworkz@xxxxxxxxx> wrote: > From: AJ Jaghori <ciscoworkz@xxxxxxxxx> > Subject: Re: What basis we have to construct NHAF for IBGP and EBGP? > To: venkat5555in@xxxxxxxxx, ietf@xxxxxxxx > Date: Sunday, 23 November, 2008, 2:59 AM > Venkat, > > Can you provide some further configs on R1 and R3? I'm > a bit confused > as to how Cisco is advertising these routes? > > On 11/21/08, Venkateshwaran R > <venkat5555in@xxxxxxxxx> wrote: > > 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 > > > > > > > > > > > > Add more friends to your messenger and enjoy! Go > to > > http://messenger.yahoo.com/invite/ > > > > _______________________________________________ > > Ietf mailing list > > Ietf@xxxxxxxx > > https://www.ietf.org/mailman/listinfo/ietf > > > > > -- > AJ Jaghori > Chief Network Architect | Author | Professor > ciscoworkz@xxxxxxxxx > M: 703.362.5002 Get perfect Email ID for your Resume. Grab now http://in.promos.yahoo.com/address _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf