• Dot1q tagged LACPDU

 
 
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Introduction

This document provides details on how 802.1Q tagged LACP packets are handled on our Arista device.

802.1Q tagged LACP PDUs

The LACP PDU frames were ingressing from other vendors into an Arista switch with an 802.1Q tag and designated as VLAN 0.

10:03:58.521076 58:ac:78:f2:8c:05 > 01:80:c2:00:00:02, ethertype 802.1Q (0x8100), length 128: vlan 0, p 0, ethertype Slow Protocols, LACPv1, length 110

10:03:59.421028 58:ac:78:f2:8c:05 > 01:80:c2:00:00:02, ethertype 802.1Q (0x8100), length 128: vlan 0, p 0, ethertype Slow Protocols, LACPv1, length 110

Natively, EOS discards tagged LACP PDUs as they are out of spec. These discards can be observed using the following command:

“show lacp counters all-ports”

  • It will show up as Illegal in the counters.

In order to accommodate our customers, we implemented a feature that allows our switches to accept tagged LACP PDUs, beginning 4.15.2F version. To implement, use the following commands:

int po601
l2-protocol encapsulation dot1q vlan vlan#     
***[note that BOTH vlan 0 and whatever Vlan entered here will be accepted. Vlan 0 is implicitly accepted]***

Please note that this command should be entered on the logical (Port-channel) interface.

Reference

https://eos.arista.com/lacp-dot1q/


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