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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Enabling Additional Paths

The additional path allows the advertisement of more paths in addition to the best path. Enabling additional path allows the advertisement of multiple paths for the same address prefix without the new paths replacing any previous paths. The additional path feature is disabled by default.

NOTE Dell EMC Networking OS recommends not to use multipath and add path simultaneously in a route reflector.

To allow multiple paths sent to peers, use the following commands.

  1. Allow the advertisement of multiple paths (send, receive or both).
    CONFIG-ROUTER-BGP or CONFIG-ROUTER-BGP-AF mode
    bgp add-path [both | enable | receive | send] path-count
    Configure the following parameters:
    • both: Indicate that the system sends and accepts multiple paths from peers.
    • enable: Indicate that the system enables add-path support for the node.
    • send: Indicate that the system sends multiple paths to peers.
    • receive: Indicate that the system accepts multiple paths from peers.
    • path-count: Indicate that the system sends multiple paths to peers. The range is from 2 to 64.
  2. Allow the specified neighbor or peer group to allow multiple path advertisements.
    CONFIG-ROUTER-BGP or CONFIG-ROUTER-BGP-AF mode
    neighbor [ip-address | ipv6–address | peer-group-name] add-path [send | receive | both] path-count
    NOTE The path-count parameter controls the number of paths that are advertised, not the number of paths that are received.

Example configuration for enabling additional paths

DellEMC# configure terminal
DellEMC(conf)# router bgp 400
DellEMC(conf-router_bgp)# neighbor 10.10.10.1 remote-as 500
DellEMC(conf-router_bgp)# bgp add-path both 2
DellEMC(conf-router_bgp)# address-family ipv4 multicast
DellEMC(conf-router_bgp_af)# neighbor 10.10.10.1 activate
DellEMC(conf-router_bgp_af)# neighbor 10.10.10.1 add-path both 3
DellEMC(conf-router_bgp_af)# exit

The above configuration example shows how to enable BGP additional paths to be sent and received with a maximum of two additional paths to the peers. You can configure the neighbor to send and receive additional paths using the neighbor add-pathcommand at the address family configuration level.

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