MDS9148 cdp not working

[cmarva]

Assisting our storage guys with some 9148s. We did a software upgrade from 5.0.1a to 5.2.8d. Now we do not see cdp adverts from the mgmt0 interface of the 9148s. Doing a sho cdp traffic int mgmt0 shows that the 9148s aren't even sending them, even though cdp is not disabled. Has anyone run into this before? I did see some bugs in older code but it seemed like it was malformed packets being sent, not packets not being sent at all.

I don't work with the MDS, but I am familiar with nx-os, and I don't think I missed anything in the release notes. Has anyone seen this before, or did I miss something in the release notes?

Thanks - chris

[jihicks]

Hi Chris,

I have a 9148 in the TAC lab running NX-OS 5.2(8d) and I see the ethernet switch adjacent to the mgmt0 interface.

Could CDP be disabled on the ethernet switch maybe?

Here are some displays that might help. 

9148# show cdp neighbors

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

qDevice-ID          Local Intrfce  Hldtme Capability  Platform      Port ID
san-34-16-2960
                    mgmt0          146    S I       WS-C2960-48TC Fas0/8

9148# show cdp traffic interface mgmt 0
----------------------------------------
Traffic statistics for mgmt0
Input Statistics:
    Total Packets: 22607
    Valid CDP Packets: 22607
        CDP v1 Packets: 0
        CDP v2 Packets: 22607
    Invalid CDP Packets: 0
        Unsupported Version: 0
        Checksum Errors: 0
        Malformed Packets: 0

Output Statistics:
    Total Packets: 4
        CDP v1 Packets: 0
        CDP v2 Packets: 4
    Send Errors: 0

9148# show cdp interface mgmt 0
mgmt0 is up
    CDP enabled on interface
    Refresh time is 60 seconds
    Hold time is 180 seconds

9148(config)# cdp ?
  advertise  Highest CDP version supported on the switch
  enable     Enable/disable CDP on all interfaces
  format     Device ID format for CDP
  holdtime   CDP hold time advertised (in seconds)
  timer      CDP refresh time interval (in seconds)

Best regards,

Jim

[cmarva]

I appreciate the reply, but it's the other direction. I do see the mgmt switch as a neighbor on the MDS. I do not see the MDS as a neighbor on the mgmt switch. The sho traffic on the MDS mgmt0 shows that it is not sending out cdp adverts. Your output above shows 4 packets sent. Mine shows 1 packet sent.
 

Device-ID          Local Intrfce  Hldtme Capability  Platform      Port ID
ahn-papmgmt-3750-1.wpahs.org
                    mgmt0          133    S I       WS-C3750G-48T Gig1/0/8
ahn-sec-fc-sw-02#

ahn-papmgmt-3750-1#sh cdp nei g1/0/8
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
ahn-papmgmt-3750-1#

If I look at another port that has a 9148 running 5.0(1a) on the same switch, I see the mds:

ahn-papmgmt-3750-1#sh cdp nei g1/0/15
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
ahn-sec-fc-sw-01(AMS18110877)
                 Gig 1/0/15        157            R S I C DS-C9148- mgmt0
ahn-papmgmt-3750-1#

not that big a deal, more of a luxury than anything. Haven't tried yet, but going to enable lldp also and see what happens.

Thanks again - chris

[jihicks]

Hi Chris,

What is the output of this command?

show cdp traffic interface mgmt 0

Could it be CDP version mismatch?

Jim

[cmarva]

Jim,

on the v5.2 9148:

ahn-sec-fc-sw-02# sh cdp traf int mgmt 0
----------------------------------------
Traffic statistics for mgmt0
Input Statistics:
    Total Packets: 1141
    Valid CDP Packets: 1141
        CDP v1 Packets: 0
        CDP v2 Packets: 1141
    Invalid CDP Packets: 0
        Unsupported Version: 0
        Checksum Errors: 0
        Malformed Packets: 0

Output Statistics:
    Total Packets: 3
        CDP v1 Packets: 0
        CDP v2 Packets: 3
    Send Errors: 0

and on the v5.0 9148:

ahn-sec-fc-sw-01# sh cdp traf int mgmt0
----------------------------------------
Traffic statistics for mgmt0
Input Statistics:
    Total Packets: 14558
    Valid CDP Packets: 14558
        CDP v1 Packets: 409
        CDP v2 Packets: 14149
    Invalid CDP Packets: 0
        Unsupported Version: 0
        Checksum Errors: 0
        Malformed Packets: 0

Output Statistics:
    Total Packets: 28642
        CDP v1 Packets: 14244
        CDP v2 Packets: 14398
    Send Errors: 0

I don't think it's a version mismatch. The mgmt switch is definitely v2, and as far as I can tell I am not seeing any signs of errors or invalid adverts.

Thanks -chris