routing family

Unanswered Question
Giuseppe Larosa Sat, 02/21/2009 - 03:10

Hello Ali,


I'm not sure to have understood


BGP can use address-families


the conventional address family used to exchange IPv4 NLRI is

address-family ipv4 unicast


other address families exist to address different needs:


address-family ipv4 multicast


address-family vpnv4

signalling plane for L3 VPN

address family ipv4 vrf vrf-name

used for L3 VPN


address-family ipv6


and so on.


the address-family are the arguments the two speakers can talk about


Hope to help

Giuseppe


Harold Ritter Sat, 02/21/2009 - 04:50

Ali,


Are you referring to Link State routing protocols, in which all routers have to build a root tree to all other routers in the network with themselves as the root.


In this case, you could include ospf and isis for IP and nlsp for ipx.


Regards

Harold Ritter Sat, 02/21/2009 - 05:01

Ali,



> i mean how the router has to build map for the routing domain


Each router runs the Shortest Path First (SPF) algorithm and build a root tree with itself as the root. The result of this calculation is a best path to each subnet in the network.


2) OSPF LSA type 4 is used to provide connectivity to a given ASBR. All areas in the autonomous system will have this lsa type 4, except for the area where the ASBR resides. This area doesn't need the LSA type 4 to calculate connectivity to the ASBR as it will use the LSA type 1 and 2 to do so.


Regards

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