The mpls l2vpn nd-dual-sending command enables ND dual feed and sets an aging time for ND entries. After ND dual feed is enabled on an AC interface, this interface forwards upstream ND packets to both the primary and secondary PWs.
The undo mpls l2vpn nd-dual-sending command disables dual feed for ND packets.
By default, ND dual feed is disabled.
| Parameter | Description | Value |
|---|---|---|
| expire-time expire-time |
Specifies an aging time for ND entries. ND entries will age after the aging time expires. To ensure communication reliability, you need to update ND entries when they are invalid. A dynamic ND entry has a life cycle. If a dynamic ND entry is not updated before its life cycle ends, this dynamic ND entry will be deleted from the ND table. The life cycle is called aging time. If the entry is updated before its life cycle expires, the aging time of the entry is recalculated. To change the aging time of dynamic ND entries, specify the expire-time expire-time parameter, which ensures that dynamic ND entries are updated in time. |
The value is an integer ranging from 60 to 4294967295, in seconds. The default value is 3600s. The value of 4294967295 indicates that ND entries do not age. |
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Usage Scenario
In an L2VPN PW redundancy scenario, user-side ND packets are transparently transmitted through the primary PW, which implements 1:1 protection and single feed and dual receiving. As a result, the secondary PW cannot learn ND entries from the user side. If a node fault occurs on the primary PW, the secondary PW learns the user-side ND entries only after traffic is switched to the secondary PW. This causes part of the traffic to be lost.
To resolve this problem, run the mpls l2vpn nd-dual-sending command to enable ND dual feed so that the primary and secondary PWs both transparently transmit ND packets.Precautions
After this command is run, common service packets are still transparently transmitted through the primary PW, which does not allow dual feed.
This command can be run on an interface that is not configured with PW redundancy, but the configuration does not take effect.<HUAWEI> system-view [~HUAWEI] interface GigabitEthernet 0/1/0 [~HUAWEI-GigabitEthernet0/1/0] mpls l2vc 1.1.1.1 1 [*HUAWEI-GigabitEthernet0/1/0] mpls l2vc 2.2.2.2 2 secondary [*HUAWEI-GigabitEthernet0/1/0] mpls l2vpn nd-dual-sending expire-time 2400