“Forward address” is a field seen in LSA 5 and LSA7. It indicates the address to which the traffic should be forwarded for an advertised external prefix (LSA5). If the value is set to 0.0.0.0, this means that the traffic should be forwarded to the ASBR(Advertising-Address). In some situations, the forwarding address will be nonzero, […]

Methods to block Type 5 LSA:     On ASBR, block the prefix using distribute-list.     On ASBR, block the prefix while redistribution into OSPF.     On ASBR, block the prefix while summarization.     On any ABR block the Forward Address the if Type 5 LSA is having a non zero Forward Address.  This method will […]

Class-based Tunnel Selection is feature that enables you to route the traffic in core backbone with different class of service (Precedence/DSCP/EXP) values onto different TE tunnels between Head end and Tail End routers. Consider the diagram below: Aim: We need to have the connectivity b/w two customer sites of customer “xyz”. As shown in the […]