12-09-2013 08:28 AM - edited 03-01-2019 07:28 AM
We have a pair of Nexus 7009 running image 6.2(2a). All the buling access switches 2960 are connected to them through ten gig uplink. When i do sh cdp neighbour on one of the buling switch to see the connectivity with Nexus core switches. It shows below output.
Access_SW01#sh cdp neighbor
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
CS7009-A Ten 1/0/1 159 R S I C N7K-C7009 Eth 3/15
CS7009-B Ten 1/0/2 164 R S C N7K-C7009 Eth 3/15
My question is why it shows different Capability mean CS7009-A shows RSIC & CS7009-B shows RSC. Both core switches having identical software version, identical config & rest of the things.
Thanks
12-09-2013 08:43 AM
It appears IGMP isn't enabled on the B switch or has been disabled on e3/15.
What does 'sh ip igmp int e 3/15' report on 7009-B ?
12-09-2013 08:58 AM
Matthew many thanks indeed for your prompt response but i would like to tell you that when i do sh cdp neighbour on other building access switch. It given different output & shows both link capability RSC. I really confused why it shows different different outputs. It supposed to be identical as I am running identical configuration on both core switches. Please advise
Access_SW02#sh cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
CS7009-A Ten 1/0/1 142 R S C N7K-C7009 Eth 3/13
CS7009-B Ten 1/0/2 132 R S C N7K-C7009 Eth 3/13
12-09-2013 09:06 AM
Please capture 'sh ip igmp int e 3/15' for BOTH 7009s.
-mw
12-11-2013 02:09 AM
Dear Matthew,
Please find requested output.
sh ip igmp interface ethernet 3/15
CS7009-A# sh ip igmp interface ethernet 3/15
IGMP is disabled on Ethernet3/15
!
CS7009-B# sh ip igmp interface ethernet 3/15
IGMP is disabled on Ethernet3/15
sh cdp neighbors interface ethernet 3/15 CS01
CS7009-A# sh cdp neighbors interface ethernet 3/15
Capability Codes: R - Router, T - Trans-Bridge, B - Source-Route-Bridge
S - Switch, H - Host, I - IGMP, r - Repeater,
V - VoIP-Phone, D - Remotely-Managed-Device,
s - Supports-STP-Dispute
Device-ID Local Intrfce Hldtme Capability Platform Port ID
Access_SW01 Eth3/15 173 S I WS-C2960S-48F Ten1/0/1
CS7009-A# sh cdp neighbors interface ethernet 3/15 detail
----------------------------------------
Device ID:Access_SW01
VTP Management Domain Name: XYZ-Domain
Interface address(es):
IPv4 Address: 1.1.1.1
Platform: WS-C2960S-48F, Capabilities: Switch IGMP Filtering
Interface: Ethernet3/15, Port ID (outgoing port): TenGigabitEthernet1/0/1
Holdtime: 167 sec
Version:
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(58)SE2, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Thu 21-Jul-11 02:22 by prod_rel_team
Advertisement Version: 2
Native VLAN: 1
Duplex: full
Mgmt address(es):
IPv4 Address: 1.1.1.1
Thanks
12-31-2013 02:35 AM
Hope you have not enabled bundling...
Might be due to any multicast enabled vlan active via int E1/15 of switch a. E1/13 might be carrying different set of vlan.... wild wild guess.
01-18-2014 01:31 PM
Can we have a look at the N7K configs and one of the 2960 configs if they are identical.
Cheers,
-amit singh
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