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Two eth-trunk sub-interface directly connected but can't ping each other

Latest reply: Aug 31, 2018 05:52:04 588 7 0 0 0

Hi, everyone! Today I’m going to introduce two eth-trunk sub-interface directly connected but can't ping each other cases.


The topology is this : S6700(eth-trunk100.100)----S6700(eth-trunk100.100).


The configuration of interface is below:


SW1:

interface Eth-Trunk100 

undo portswitch

#

interface Eth-Trunk100.100

 dot1q termination vid 100

 ip address 172.16.0.1 255.255.255.252


SW2:

interface Eth-Trunk100

 undo portswitch

#

interface Eth-Trunk100.100

 dot1q termination vid 100

 ip address 172.16.0.2 255.255.255.252


The issue is that ping from SW1 to SW2 is not reachable.


checking the ARP table and found that can't learning peer arp information;


Solution is that: add the arp broadcast enable command on the sub-interface eth-trunk.


interface Eth-Trunk100.100  arp broadcast enable


The reason is that: VLAN tag termination sub-interfaces discard broadcast packets after receiving the packets. To permit a VLAN tag termination sub-interface to forward broadcast packets, run the arp broadcast enable command on the sub-interface to enable ARP broadcast.


You are welcome to ask me any questions!


  • x
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KarimUC
Created Aug 5, 2018 13:52:04

:)
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wissal
MVE Author Created Aug 6, 2018 07:12:13

Two eth-trunk sub-interface directly connected but can't ping each other-2715627-1
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I%20would%20like%20to%20share%20with%20you%20my%20experience%2C%20I%20am%20a%20telecommunications%20engineer%2C%20currently%20senior%20project%20manager%20at%20a%20telecom%20operator%20who%20is%20a%20partner%20of%20Huawei%2C%20in%20the%20radio%20access%20networks%20department%2C%20during%20my%20career%20I%20have%20managed%20various%20projects%20for%20various%20network%20nodes.%3Cbr%2F%3EAt%20the%20same%20time%2C%20temporarily%20I%20give%20courses%20in%20telecom%20engineering%20schools%2C%20to%20bring%20the%20operational%20side.
user_3143595
Created Aug 21, 2018 13:21:23

Why not? Two eth-trunk sub-interface directly connected but can't ping each other-2732625-1
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Barret
Created Aug 31, 2018 05:51:33

The reason is that: VLAN tag termination sub-interfaces discard broadcast packets after receiving the packets. To permit a VLAN tag termination sub-interface to forward broadcast packets, run the arp broadcast enable command on the sub-interface to enable ARP broadcast.
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  • x
  • convention:

Barret
Created Aug 31, 2018 05:51:39

The reason is that: VLAN tag termination sub-interfaces discard broadcast packets after receiving the packets. To permit a VLAN tag termination sub-interface to forward broadcast packets, run the arp broadcast enable command on the sub-interface to enable ARP broadcast.
View more
  • x
  • convention:

Barret
Created Aug 31, 2018 05:51:52

The reason is that: VLAN tag termination sub-interfaces discard broadcast packets after receiving the packets.
View more
  • x
  • convention:

Barret
Created Aug 31, 2018 05:52:04

The reason is that: VLAN tag termination sub-interfaces discard broadcast packets after receiving the packets.
View more
  • x
  • convention:

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