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Two eth-trunk sub-interfa...

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

Latest reply: Aug 31, 2018 05:52:04 471 7 0 0
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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. This post was last edited by Barret at 2018-08-05 13:07.
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KarimUC
Created Aug 5, 2018 13:52:04 Helpful(0) Helpful(0)

:)
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wissal
MVE Created Aug 6, 2018 07:12:13 Helpful(0) Helpful(0)

Two eth-trunk sub-interface directly connected but can't ping each other-2715627-1
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user_3143595
Created Aug 21, 2018 13:21:23 Helpful(0) Helpful(0)

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 Helpful(0) Helpful(0)

Posted by user_3143595 at 2018-08-21 13:21 Why not?
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.
  • x
  • convention：
Barret
Created Aug 31, 2018 05:51:39 Helpful(0) Helpful(0)

Posted by user_3143595 at 2018-08-21 13:21 Why not?
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.
  • x
  • convention：
Barret
Created Aug 31, 2018 05:51:52 Helpful(0) Helpful(0)

Posted by user_3143595 at 2018-08-21 13:21 Why not?
The reason is that: VLAN tag termination sub-interfaces discard broadcast packets after receiving the packets.
  • x
  • convention：
Barret
Created Aug 31, 2018 05:52:04 Helpful(0) Helpful(0)

Posted by user_3143595 at 2018-08-21 13:21 Why not?
The reason is that: VLAN tag termination sub-interfaces discard broadcast packets after receiving the packets.
  • x
  • convention：
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