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

Created Aug 05, 2018 21:04:21Latest reply Aug 31, 2018 13:52:04 353 7 0 0
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 2018-8-5 21:07.
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KarimUC  Adept   Created Aug 05, 2018 21:52:04 Helpful(0) Helpful(0)

:)
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wissal     Created Aug 06, 2018 15:12:13 Helpful(0) Helpful(0)

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user_3143595     Created Aug 21, 2018 21:21:23 Helpful(0) Helpful(0)

Why not?
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Barret  Adept   Created Aug 31, 2018 13:51:33 Helpful(0) Helpful(0)

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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Barret  Adept   Created Aug 31, 2018 13:51:39 Helpful(0) Helpful(0)

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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Barret  Adept   Created Aug 31, 2018 13:51:52 Helpful(0) Helpful(0)

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

Barret  Adept   Created Aug 31, 2018 13:52:04 Helpful(0) Helpful(0)

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

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