Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 147
Next Hop, Multiprotocol BGP, Implementing BGP with FTOS
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Next Hop The Next Hop is the IP address used to reach the advertising router. For EBGP neighbors, the Next-Hop address is the IP address of the connection between the neighbors. For IBGP, the EBGP Next-Hop address is carried into the local AS. A Next Hop attribute is set when a BGP speaker advertises itself to another BGP speaker outside its local AS. It can also be set when advertising routes within an AS. The Next Hop attribute also serves as a way to direct traffic to another BGP speaker, rather than waiting for a speaker to advertise. FTOS allows you to set the Next Hop attribute in the CLI. Setting the Next Hop attribute lets you determine a router as the next hop for a BGP neighbor. Multiprotocol BGP e c MBGP for IPv6 unicast is supported on platforms c e s MBGP for IPv4 Multicast is supported on platform Multiprotocol Extensions for BGP (MBGP) is defined in IETF RFC 2858. MBGP allows different types of address families to be distributed in parallel. This allows information about the topology of IP Multicast-capable routers to be exchanged separately from the topology of normal IPv4 and IPv6 unicast routers. It allows a multicast routing topology different from the unicast routing topology. Note: It is possible to configure BGP peers that exchange both unicast and multicast network layer reachability information (NLRI), but you cannot connect Multiprotocol BGP with BGP. Therefor, You cannot redistribute Multiprotocol BGP routes into BGP. Implementing BGP with FTOS Advertise IGP cost as MED for redistributed routes When using multipath connectivity to an external AS, you can advertise the MED value selectively to each peer for redistributed routes. For some peers you can set the internal/IGP cost as the MED while setting others to a constant pre-defined metric as MED value. FTOS 8.3.1.0 and later support configuring the set metric-type internal command in a route-map to advertise the IGP cost as the MED to outbound EBGP peers when redistributing routes. The configured set metric value overwrites the default IGP cost. By using the redistribute command in conjunction with the route-map command, you can specify whether a peer advertises the standard MED or uses the IGP cost as the MED. Note the following when configuring this functionality: Border Gateway Protocol IPv4 (BGPv4) | 147
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