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[troubleshooting Case]MPLS LDP session can't go up fast after the link was shutdown/undo shutdown at VLAN tag termination sub-interface

Latest reply: Dec 27, 2018 07:08:35 666 2 0 0 0
we had an interesting case, we configured ISIS and MPLS LDP at a qinq termination sub-interface, after shutdown/undo shutdown this link, we found that the ISIS can go up fast, but MPLS LDP can't go up right away, it waits about 20 minutes to be up.


below is the configuration for this interface:
interface Eth-Trunk1.100
 ip address 185.241.224.36 255.255.255.254
 encapsulation qinq-termination rt-protocol
 qinq termination pe-vid 100 ce-vid 4094
 isis enable 10
 isis circuit-type p2p
 isis authentication-mode hmac-sha256 key-id 1 cipher %^%#76$b,YPxJ1Ej5X>L39.ZwdeG;Gg'#V_<KCRhC4e6X{|.89Ve0@B@"0*&3l`Ciw!'A$-<V9nU{Y67n@QJ%^%#
 isis ppp-negotiation 3-way only
 mpls
 mpls ldp
#

when the link go up, we found that even the ARP is not learned, the ARP is incompleted.

after we looked into the product documentation, we test a command:
"arp broadcast enable", 
we tried this command, and found that it works after configure this command.

this is a typical case. when we configured a VLAN tag termination sub-interface, we always need to configure this command, otherwise, it may has performance problem.

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Busy_with_lazy_mind
Created Jul 16, 2018 06:25:35

good sharing.
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dagui
Created Dec 27, 2018 07:08:35

we tried this command, and found that it works after configure this command.Can you provide a more detailed explanation?
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