Bgp Next Hop Tracking; Configure Bgp Next-Hop Trigger Delay - Cisco NCS 5500 Series Configuration Manual

Implementing BGP
• Discard Attribute— Discards this attribute. The matching attributes alone are discarded and the rest of the Update
message is processed normally.

BGP Next Hop Tracking

BGP receives notifications from the Routing Information Base (RIB) when next-hop information changes
(event-driven notifications). BGP obtains next-hop information from the RIB to:
• Determine whether a next hop is reachable.
• Find the fully recursed IGP metric to the next hop (used in the best-path calculation).
• Validate the received next hops.
• Calculate the outgoing next hops.
• Verify the reachability and connectedness of neighbors.
BGP Next Hop Reference, on page 134

Configure BGP Next-Hop Trigger Delay

Perform this task to configure BGP next-hop trigger delay. The Routing Information Base (RIB) classifies
the dampening notifications based on the severity of the changes. Event notifications are classified as critical
and noncritical. This task allows you to specify the minimum batching interval for the critical and noncritical
events.
SUMMARY STEPS
1. configure
2. router bgp as-number
3. address-family { ipv4 | ipv6 } unicast
4. nexthop trigger-delay { critical delay | non-critical delay }
5. commit
DETAILED STEPS
Step 1 configure
Step 2 router bgp as-number
Example:
RP/0/RP0/CPU0:router(config)# router bgp 120
Specifies the autonomous system number and enters the BGP configuration mode, allowing you to configure the BGP
routing process.
provides additional conceptual details on BGP next hop.
BGP Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
BGP Next Hop Tracking
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