VLAN's not reflecting in CAT3560 which is cascade with Nexus 2K switch

balajirajahpb · ‎10-19-2010

Dear All,

VLAN's are not populating in CAT3560 which is cascaded with nexus 2k switch.

NEX# show interface Ethernet101/1/2 switchport
Name: Ethernet101/1/2
Switchport: Enabled
Switchport Monitor: Not enabled
Operational Mode: trunk
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1000 (TRUNKDEF)
Trunking VLANs Enabled: 1-3967,4048-4093
Administrative private-vlan primary host-association: none
Administrative private-vlan secondary host-association: none
Administrative private-vlan primary mapping: none
Administrative private-vlan secondary mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs:
Operational private-vlan: none
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled

CAT#show interfaces gi1/1 switchport
Name: Gi1/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1000 (Inactive)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

Regards

BR

Jon Marshall · ‎10-19-2010

Can you post a "sh vtp status" from the 3560 ?

Jon

balajirajahpb · ‎10-19-2010

Dear Jon

Please find the output of show vtp status from CAT3560

CAT#show vtp status
VTP Version capable             : 1 to 3
VTP version running             : 2
VTP Domain Name                 : XXXXX (domain name)
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Enabled
Device ID                       : d0d0.fdaa.6a80
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

Feature VLAN:
--------------
VTP Operating Mode                : Client
Maximum VLANs supported locally   : 1005
Number of existing VLANs          : 6
Configuration Revision            : 0
MD5 digest                        : 0x74 0xF6 0xE7 0x6F 0x33 0xFD 0x1D 0x72
                                    0x57 0xFB 0x1E 0xCB 0xE9 0xA5 0xD5 0xD8

Regards

BR

Jon Marshall · ‎10-19-2010

Where is the VTP server in all this ?

I don't believe the N2K supports VTP at all unless you know differently. And the Nexus parent switch for the N2K will only support VTP transparent. Which switch are you using as the parent switch ie. a N5K or an N7K ?

Jon

balajirajahpb · ‎10-19-2010

Dear Jan,

cat 6500 is cascade with nexus 5K .5 K has two fex 2k

from 2k cat3560 is cascade

vtp server is cat6500 and cat 3560 is vtp client.

Hope I explained clearly

Regards

BR

Jon Marshall · ‎10-19-2010

What version of NX-OS are you running on the 5K ?

Jon

balajirajahpb · ‎10-20-2010

Dear Jan,

CAT6500 is VTP server

Nexus 5K - VTP Tranparent

Nexus 5K has two 2K connected (fex)

CAT3560 is cascade with one 2K - VTP Client

Nexus OS details

BIOS:      version 1.3.0
loader:    version N/A
kickstart: version 4.2(1)N2(1)
system:    version 4.2(1)N2(1)
power-seq: version v1.2
BIOS compile time:       09/08/09
kickstart image file is: bootflash:/n5000-uk9-kickstart.4.2.1.N2.1.bin
kickstart compile time: 7/28/2010 18:00:00 [07/29/2010 03:10:19]
system image file is:    bootflash:/n5000-uk9.4.2.1.N2.1.bin
system compile time:     7/28/2010 18:00:00 [07/29/2010 07:18:12]

NEX# show vtp status
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 1005
VTP Operating Mode              : Transparent
VTP Domain Name                 : UNICC
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Enabled
VTP Traps Generation            : Disabled

CAT-3560#show vtp status
VTP Version capable             : 1 to 3
VTP version running             : 2
VTP Domain Name                 : XXXXX (Domain name)
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Enabled
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

Feature VLAN:
--------------
VTP Operating Mode                : Client
Maximum VLANs supported locally   : 1005
Number of existing VLANs          : 6
Configuration Revision            : 0
MD5 digest                        : 0x74 0xF6 0xE7 0x6F 0x33 0xFD 0x1D 0x72
                                    0x57 0xFB 0x1E 0xCB 0xE9 0xA5 0xD5 0xD8

Regards

BR

casaenz · ‎10-19-2010

You might want to check the VTP mode on your 5K Nexus. If it is off it will just drop the VTP packets sent by the 6500 instead of forwarding them to the downstream 3750:

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/VLANs.html#wp1157301

VLAN Trunking Protocol (VTP) mode is OFF. VTP BPDUs are dropped on all interfaces of a Cisco Nexus 5000 Series switch, which partitions VTP domains if other switches have VTP turned on.