Next Hop; Multiprotocol Bgp; Implementing Bgp With Ftos; Additional Path (Add-Path) Support - Dell Force10 S4810P Configuration Manual

High-density, 1ru 48-port 10gbe switch

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Table of Contents

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

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.

MBGP for IPv6 unicast is supported on platforms

MBGP for IPv4 Multicast is supported on platform

Multiprotocol Extensions for BGP (MBGP) is defined in IETF RFC 2858. MBGP allows dif f erent 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. Therefore, you

cannot redistribute Multiprotocol BGP routes into BGP.

BGP Add-path is supported on platforms

The Add-path feature reduces convergence times by advertising multiple paths to its peers for the same

address prefix without replacing existing paths with new ones. By default, a BGP speaker advertises only

the best path to its peers for a given address prefix. If the best path becomes unavailable, the BGP speaker

withdraws it path from its local RIB and recalculates a new best path. This requires both IGP and BGP

convergence and can therefore be a lengthy process. BGP Add-path also helps switchover to the next new

best path when the current best path is unavailable.

Border Gateway Protocol