Posted on July 27, 2018 3:25 am
 |  Asked by Bhushan S
 |  1487 views
RESOLVED
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Hi Techies,

I am facing a weird issue where if I disable a port on 1 physical switch and the status of the port in same vlan on another physical switch changes from “connected” to “notconnect”.

Set up information –

We have 2xArista 7010T in one of our Data Centre, connected with peer links (Software image version: 4.16.8M). We have 2 X VPLS links delivered by the ISP and 1 link is connected to port et38 on each switch in same vlan. From downstream perspective, we have 1 port from each switch connected to the firewall which is acting as a layer 3 device in the network.

The issue we are facing is, when I disable port et38 on switch 1, the status of the port et38 on switch 2 changes from “connected” to “notconnect”. The status of the port et38 on switch 1 changes from “connected” to “disabled” which is expected.

Can anyone shed any light on the issue we are facing?

Thanks in Advance

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Posted by ma
Answered on July 27, 2018 7:01 am

Hi Bhushan,

Have you run the “show mlag config-sanity” command to ensure that you don’t have any configuration inconstancy between the MLAG peers. Assuming you’re running MLAG between the two 7010T.

-Michael

Hi Michael,

Thanks for our response. Yes checked configuration inconstancy between the MLAG and none present. You are correct to assume re MLAG between both 7010T’s

(Bhushan S at July 30, 2018 1:23 am)
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Answered on July 28, 2018 9:24 am

Hi Bhushan,

In addition to the mlag check, checking the physical outputs of the weirdly-behaving interface should help.
If the physical layer is down, then the firewall have stopped sending signal and it must be checked (perhaps some kind of status sync between the interfaces?)

Here’s an example of the phy output:


up380...09:20:00#show int et1/1 phy
Key:
U = Link up
D = Link down
R = RX Fault
T = TX Fault
B = High BER
L = No Block Lock
A = No XAUI Lane Alignment
0123 = No XAUI lane sync in lane N

State Reset
Port PHY state Changes Count PMA/PMD PCS XAUI
-------------- --------------- -------- -------- ------- ----- --------
Ethernet1/1 linkUp 4 0 D.. D..A0123

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Posted by Bhushan S
Answered on August 3, 2018 12:53 am

Hi All,

Thanks for all the inputs. I believe we have resolved the problem and it was a cabling issue. I haven’t had a visibility of the physical set up as this site is remote to me.

Thanks again,
B

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