Checking The Configurations - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
In a 6PE FRR scenario, if the device on which FRR is configured completes refreshing
forwarding entries before the intermediate device on the primary path does so after the primary
path recovers, traffic may be temporarily lost after it switches back to the primary path from the
backup path. The severity of packet loss is proportional to the number of routes stored on the
intermediate device. To solve this problem, perform any of the following operations to prevent
path-switchover-triggered packet loss:
l In the BGP view of the intermediate device on the primary path, run:
l In the BGP IPv6 unicast address family view of the intermediate device on the primary path,
l In the BGP IPv6 unicast address family view of the device on which FRR is configured, run:
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9.15.4 Checking the Configurations

After IPv6 Provider Edge (6PE) FRR is configured, you can view information about the backup
next hop and backup label of the 6PE routes on 6PE devices.
Prerequisites
6PE FRR has been configured.
Issue 02 (2014-09-30)
out-delay delay-value
A delay for sending Update packets to all BGP peers is configured. An appropriate delay
ensures that traffic switches back to the primary path after the intermediate device on the
primary path completes refreshing forwarding entries.
The delay-value value is an integer ranging from 0 to 3600, in seconds. The default delay-
value value is 0, indicating that the intermediate device on the primary path sends Update
packets without a delay. The delay-value value is inversely proportional to the route
convergence performance of the device on which FRR is configured.
run:
peer { group-name | ipv6-address } out-delay delay-value
A delay for sending Update packets is configured. An appropriate delay ensures that traffic
switches back to the primary path after the intermediate device on the primary path completes
refreshing forwarding entries.
The delay-value value is an integer ranging from 0 to 3600, in seconds. The default delay-
value value is 0, indicating that the intermediate device on the primary path sends Update
packets without a delay. The delay-value value is inversely proportional to the route
convergence performance of the device on which FRR is configured.
route-select delay delay-value
A delay for selecting a route to the intermediate device on the primary path is configured.
An appropriate delay ensures that traffic switches back to the primary path after the
intermediate device completes refreshing forwarding entries.
The delay-value value is an integer ranging from 0 to 3600, in seconds. The default delay-
value value is 0, indicating that the device on which FRR is configured selects a route to the
intermediate device on the primary path without a delay.
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9 BGP4+ Configuration

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