Reference Guide

200 | Border Gateway Protocol
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Enable additional paths
By default, the add-path feature is disabled.
Use the following command in the CONFIGURATION ROUTER BGP mode to allow multiple paths sent
to peers.
Configure IP community lists
Within FTOS, you have multiple methods of manipulating routing attributes. One attribute you can
manipulate is the COMMUNITY attribute. This attribute is an optional attribute that is defined for a group
of destinations. In FTOS, you can assign a COMMUNITY attribute to BGP routers by using an IP
Community list. After you create an IP Community list, you can apply routing decisions to all routers
meeting the criteria in the IP Community list.
IETF RFC 1997 defines the COMMUNITY attribute and the pre-defined communities of INTERNET,
NO_EXPORT_SUBCONFED, NO_ADVERTISE, and NO_EXPORT. All BGP routes belong to the
INTERNET community. In the RFC, the other communities are defined as follows:
redistribute ospf process-id
[match external {1 | 2} | match
internal] [metric-type {external |
internal}] [route-map
map-name]
ROUTER BGP or
CONF-ROUTER_BGPv6_AF
Include specific OSPF routes in IS-IS. Configure
the following parameters:
• process-id range: 1 to 65535
• match external range: 1 or 2
• match internal
• metric-type: external or internal.
• map-name: name of a configured route map.
Note: Using Multipath and Add Path simultaneously in a Route Reflector is not recommended.
Step Command Syntax Command Mode Purpose
1
bgp add-path {send |
both} path-count
count
bgp add-path receive
CONFIG-ROUTER-BGP Allow the advertisement of multiple paths for the
same address prefix without the new paths
replacing any previous ones.
Range: 2-64
2 neighbor {ipaddress|
peergroup name}
add-path [send |
receive| both]
path-count count
CONFIG-ROUTER-BGP Allow the specified neighbor/peer group to send/
receive multiple path advertisements.
Note: The path-count parameter controls the number of paths that are advertised, not the number of
paths that are received.
Command Syntax Command Mode Purpose