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6-22
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, NX-OS Release 5.0(3)U1(1)
Chapter 6 Configuring Advanced BGP
Configuring Advanced BGP
Configuring eBGP
This section includes the following topics:
• Disabling eBGP Single-Hop Checking, page 6-22
• Configuring eBGP Multihop, page 6-22
• Disabling a Fast External Failover, page 6-23
• Limiting the AS-path Attribute, page 6-23
Disabling eBGP Single-Hop Checking
You can configure eBGP to disable checking whether a single-hop eBGP peer is directly connected to
the local router. Use this option for configuring a single-hop loopback eBGP session between directly
connected switches.
To disable checking whether or not a single-hop eBGP peer is directly connected, use the following
command in neighbor configuration mode:
Configuring eBGP Multihop
You can configure the eBGP time-to-live (TTL) value to support eBGP multihop. In some situations, an
eBGP peer is not directly connected to another eBGP peer and requires multiple hops to reach the remote
eBGP peer. You can configure the eBGP TTL value for a neighbor session to allow these multihop
sessions.
To configure eBGP multihop, use the following command in neighbor configuration mode:
Command Purpose
dont-capability-negotiate
Example:
switch(config-router-neighbor)#
dont-capability-negotiate
Disables capabilities negotiation. You must
manually reset the BGP sessions after configuring
this command.
Command Purpose
disable-connected-check
Example:
switch(config-router-neighbor)#
disable-connected-check
Disables checking whether or not a single-hop
eBGP peer is directly connected. You must
manually reset the BGP sessions after using this
command.
Command Purpose
ebgp-multihop
ttl-value
Example:
switch(config-router-neighbor)#
ebgp-multihop 5
Configures the eBGP TTL value for eBGP
multihop. The range is from 2 to 255. You must
manually reset the BGP sessions after using this
command.
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