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

Created: Jul 15, 2018 09:07:34Latest 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.

x
convention：

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

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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

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