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Today's Topics:
1. Re: Cisco N5k Trunk VLANs not found for ports on FEX
(Jeroen van Ingen)
--- Begin Message ---
Hi Christian,
Good question. I checked and re-checked, but we only see correct
port-channel data for ports on the 5596's themselves. Data for
port-channels on FEX is incomplete: no proper relation between the
logical port-channel interface and its member interfaces in Netdisco
when a FEX is involved, and VLAN information is incorrect when the
port-channel interface is configured with "switchport mode trunk".
SNMP on Nexus has been flaky from the start (and not only SNMP); I'm
looking forward to our next datacenter network overhaul which probably
won't use a solution with "fabric extenders" en hopefully won't use
Cisco switches.
Regards,
Jeroen van Ingen
ICT Service Centre
University of Twente, P.O.Box 217, 7500 AE Enschede, The Netherlands
On 06/25/2017 02:45 PM, Christian Ramseyer wrote:
Thanks Jeroen! Just to make sure, does "reporting VLAN membership on
trunks just fine" include ports that are on fabric extenders (FEX)? It
seems only to affect these ports in our environment. Probably one of the
many peculiarities in NX-OS SNMP.
Anyways, one of our Cisco guys is trying to get support on this, I'll
post an update if something comes from that.
Christian
On 22.06.17 11:43, Jeroen van Ingen wrote:
Hi Christian,
Hmm, maybe it's a limitation or bug in the older NX-OS versions. It's
been ages since we ran a 5.x release so I don't remember if we ever had
this issue.
We currently run 6.0(2)N2(1) on the 5596's in one data center and
7.1(3)N1(2) on the 5596's in our other DC; both report VLAN membership
on trunks just fine.
Regards,
Jeroen van Ingen
ICT Service Centre
University of Twente, P.O.Box 217, 7500 AE Enschede, The Netherlands
On 06/20/2017 12:09 PM, Christian Ramseyer wrote:
Hi guys
Given this setup:
204 Po204(SU) Eth LACP Eth106/1/7(P) Eth107/1/7(P)
*** # show fex 106 detail | include 1/7
Eth106/1/7 Up Po106
*** # show fex 107 detail | include 1/7
Eth107/1/7 Up Po107
interface port-channel204
description ***
switchport mode trunk
switchport trunk allowed vlan 461,475-476
Netdisco does not show anything in the VLAN Membership. The problem is
AFAICT Cisco-based, as the FEX ports are not included in VTP-MIB, e.g.
for vlanTrunkPortDynamicStatus:
interface: 369098955 port-channel204
.1.3.6.1.4.1.9.9.46.1.6.1.1.14.369098955 = No Such Instance currently
exists at this OID
Has anybody already noticed this or maybe even found a workaround? Our
N5k here still run 5.2(1)N1(9), but from the resolved issues in
5.2(1)N1(9a) and 5.2(1)N1(9b) it doesn't look like they would be any
help.
Christian
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