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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 35 Configuring IP Unicast Routing Configuring BGP
Nonstop Forwarding Awareness
The BGP NSF Awareness feature is supported for IPv4 in the metro IP access image, beginning with
Cisco IOS Release 12.2(25)SEG. To enable this feature with BGP routing, you need to enable Graceful
Restart. When the neighboring router is NSF-capable, and this feature is enabled, the Layer 3 switch
continues to forward packets from the neighboring router during the interval between the primary Route
Processor (RP) in a router failing and the backup RP taking over, or while the primary RP is manually
reloaded for a nondisruptive software upgrade.
For more information, see the BGP Nonstop Forwarding (NSF) Awareness Feature Guide at this URL:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a008015fede.
html
Neighbor • Next hop (router as next hop for BGP neighbor): Disabled.
• Password: Disabled.
• Peer group: None defined; no members assigned.
• Prefix list: None specified.
• Remote AS (add entry to neighbor BGP table): No peers defined.
• Private AS number removal: Disabled.
• Route maps: None applied to a peer.
• Send community attributes: None sent to neighbors.
• Shutdown or soft reconfiguration: Not enabled.
• Timers: keepalive: 60 seconds; holdtime: 180 seconds.
• Update source: Best local address.
• Versio n: BGP Ver si on 4 .
• Weight: Routes learned through BGP peer: 0; routes sourced by the local router:
32768.
NSF1 Awareness Disabled2. Allows Layer 3 switches to continue forwarding packets from a neighboring
NSF-capable router during hardware or software changes.
Route reflector None configured.
Synchronization (BGP and IGP) Enabled.
Table map update Disabled.
Timers Keepalive: 60 seconds; holdtime: 180 seconds.
1. NSF = Nonstop Forwarding
2. BGP NSF Awareness can be enabled for IPv4 on Cisco ME 3400 switches with the Cisco IOS Release 12.2(25)SEG metro IP access image by enabling
Graceful Restart.
Table 35-9 Default BGP Configuration (continued)
Feature Default Setting