Configuring an update delay for local MPLS labels
BGP includes local MPLS labels in advertised VPNv4 routes, VPNv6 routes, labeled IPv4 unicast routes, and labeled IPv6 unicast routes.
When a local label is changed, BGP removes the old label and advertises the new label. Traffic interruption occurs if BGP peers use the old label to forward packets before they learn the new label. To resolve this issue, configure an update delay for local MPLS labels. BGP does not remove the old label before the update delay timer expires.
To configure an update delay for local MPLS labels:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter BGP instance view. | bgp as-number [ instance instance-name ] | N/A |
3. Configure an update delay for local MPLS labels. | retain local-label retain-time | By default, the update delay is 60 seconds. |