Send document comments to nexus3k-docfeedback@cisco.com
6-10
Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, NX-OS Release 5.0(3)U1(1)
Chapter 6 Configuring Advanced BGP
Guidelines and Limitations for BGP
• You must explicitly configure an address family under a neighbor for the BGP session
establishment.
Guidelines and Limitations for BGP
BGP has the following configuration guidelines and limitations:
• The dynamic AS number prefix peer configuration overrides the individual AS number
configuration inherited from a BGP template.
• If you configure a dynamic AS number for prefix peers in an AS confederation, BGP establishes
sessions with only the AS numbers in the local confederation.
• BGP sessions created through a dynamic AS number prefix peer ignore any configured eBGP
multihop time-to-live (TTL) value or a disabled check for directly connected peers.
• Configure a router ID for BGP to avoid automatic router ID changes and session flaps.
• Use the maximum-prefix configuration option per peer to restrict the number of routes received and
system resources used.
• Configure the update-source to establish a session with eBGP multihop sessions.
• Specify a BGP route map if you configure redistribution.
• Configure the BGP router ID within a VRF.
• If you decrease the keepalive and hold timer values, the network might experience session flaps.
Default Settings
Table 6-1 lists the default settings for BGP parameters.
Configuring Advanced BGP
This section describes how to configure advanced BGP and includes the following topics:
• Configuring BGP Session Templates, page 6-11
• Configuring BGP Peer-Policy Templates, page 6-13
• Configuring BGP Peer Templates, page 6-16
• Configuring Prefix Peering, page 6-18
• Configuring BGP Authentication, page 6-19
• Resetting a BGP Session, page 6-20
Table 6-1 Default BGP Parameters
Parameters Default
BGP feature disabled
keep alive interval 60 seconds
hold timer 180 seconds
To Next Page
Loading...
