Re: Arista MLAG to Cisco 6500 VSS [ LACP Issue ]

The Arista side must be misconfigured. It's behaving as a regular LAG not an MLAG.

Arista MLAG is like Nexus vPC, where there are two control planes & management planes that sync over a control plane peer-link. To allow for this they have to spoof a shared LACP system-ID.

The log on the Catalyst side means that the Aristas have 2 LACP IDs, which means its MLAG is broken for some reason.

Brian McGahan, 4 x CCIE #8593 (R&S/SP/SC/DC), CCDE #2013::13
bmcgahan_at_INE.com<mailto:bmcgahan_at_INE.com>

Internetwork Expert, Inc.
http://www.INE.com<http://www.ine.com/>

On Mar 5, 2014, at 5:44 PM, "Tony Singh" <mothafungla_at_gmail.com<mailto:mothafungla_at_gmail.com>> wrote:

to add

When regular port-channel config is added on the 6500 and you have different ports added on both chassis the VSS will pick this up as a MEC (multi ether-channel chassis)

It's seems it's seeing multiple macs or system-id's via the MLAG ports on the Arista

Depends on how Arista encode the frames, I don't think MLAG or MEC are RFC compliant even if LACP is

Where you could get Arista nodes communicating using MLAG

--
BR
Tony
Sent from my iPad
On 5 Mar 2014, at 21:32, Cristian Matei <cmatei_at_ine.com<mailto:cmatei_at_ine.com>> wrote:
I say it should work, is MLAG correctly configured on Arista; if so, all
ports in the ether channel towards VSS should use the same system-id? What
does B3show ether channel summaryB2 show on VSS?
Regards,
Cristian.
On 05/03/14 23:15, "Tony Singh" <mothafungla_at_gmail.com<mailto:mothafungla_at_gmail.com>> wrote:
In the system-id negotiated in your LACP frames your multi chassis lag
has a different base mac-address per unit
Hence no LACP
Had the same issue between a Cisco ASA pair going to a stackable switch,
it can't be done from what I've seen
Maybe someone will override me
--
BR
Tony
Sent from my iPad
On 5 Mar 2014, at 12:53, Taufik Kurniawan <ktaufik_at_gmail.com<mailto:ktaufik_at_gmail.com>> wrote:
Dear All,
Does anyone here has an experience to connect an arista pair (MLAG)
with a pair of 6500 (VSS).
We are trying this, but a pair of 6500 (VSS) complaining below messages
:
Feb 27 20:05:13.351: %LACP-SW1-4-MULTIPLE_NEIGHBORS: Multiple
neighbors detected on Te1/1/1: new neighbor(sys-mac-id:
001c.7318.b7e0, port: 0x29), old neighbor(sys-mac-id: 021c.7318.b7e0,
port: 0x29)
Feb 27 20:05:14.211: %LACP-SW1-4-MULTIPLE_NEIGHBORS: Multiple
neighbors detected on Te2/1/8: new neighbor(sys-mac-id:
001c.7318.ba32, port: 0x802A), old neighbor(sys-mac-id:
021c.7318.b7e0, port: 0x802A)
Blogs and organic groups at http://www.ccie.net