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Cisco Employee

Showing I/O neighbors on UCS ?

When I login to the fabric interconnects via command line, I can "connect nxos" and "show cdp neighbors".  That does a great job of showing me the north-bound Ethernet switches and any N1K connections.  I would like to do the same for the Fiber Channel connections ... to see to which MDS my UCS is uplinked.

Can I do this also within the NXOS facility?

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: Showing I/O neighbors on UCS ?

Yes, that's an excellent method to determine the actual switch it is connected to. The flogi database on the switch will show you the actual port. But, you need to know the switch to get to that part.

fabric mgmt addr: 10.x.x.x <- NPIV switch (Northbound MDS)

fabric pwwn: 20:15:00:0d:ec:cd:99:80 <- NPIV interface pwwn

4 REPLIES
Cisco Employee

Re: Showing I/O neighbors on UCS ?

you can try  "sh fcs ie"  and   "show toplogy" 

Cisco Employee

Re: Showing I/O neighbors on UCS ?

In the release code, the FC module is in NPV mode. It doesn't support FC services, show topo, fcs ie will work only in switch mode. In NPV mode, it's like a remote line card, very little on-board functionality

In order to determine neighbors via CLI:

1) On the FI side from within NX-OX, display the Pwwn of the uplink port on the FC Module

FI-A(nxos)# show interface fc 2/1 | grep WWN
    Port WWN is 20:41:00:0d:ec:d3:5d:c0

On the MDS side run "show flogi database vsan 100" <-- Whatever VSAN the connected port is in.

MDS-9506-1(config-if)# show flogi database vsan 100
--------------------------------------------------------------------------------
INTERFACE        VSAN    FCID           PORT NAME               NODE NAME
--------------------------------------------------------------------------------
fc2/13           100   0x640101  50:0a:09:81:86:78:3b:98 50:0a:09:80:86:78:3b:98
fc4/11           100   0x640102  20:41:00:0d:ec:d3:5d:c0 20:64:00:0d:ec:d3:5d:c1
fc4/12           100   0x640103  20:42:00:0d:ec:d3:5d:c0 20:64:00:0d:ec:d3:5d:c1

Total number of flogi = 3.

This show the FI fc 2/1 is connected to the MDS at fc 4/11

2) FMS will also display the connectivity

Cisco Employee

Re: Showing I/O neighbors on UCS ?

Good info ... one of the main goals is to be able to verify from the UCS, what the ID of the MDS switch is to which I am connected.  This is assuming I don't know which MDS switch.

The NPV path took me a new direction.  Can you confirm if the following example is indicating my upstream SAN switch ... or some other management device on the fabric?

FI-A(nxos)# show npv internal info external-interface all

External Interface Info:

========================

Interface Information:

  ifindex: fc2/1, Port VSAN: 101, Internal FLOGI VSAN: 101, fcid: 0x010016

  Internal FLOGI Done: True, In Progress: False

  FSM current state: NPIVP_EXT_IF_ST_UP

  fabric mgmt addr: 10.x.x.x

  fabric pwwn: 20:15:00:0d:ec:cd:99:80, fabric nwwn: 20:65:00:0d:ec:cd:99:81

  my pwwn: 20:41:00:0d:ec:df:07:40, my nwwn: 20:65:00:0d:ec:df:07:41

  fcf_mac: 000d:ecdf:0774

Cisco Employee

Re: Showing I/O neighbors on UCS ?

Yes, that's an excellent method to determine the actual switch it is connected to. The flogi database on the switch will show you the actual port. But, you need to know the switch to get to that part.

fabric mgmt addr: 10.x.x.x <- NPIV switch (Northbound MDS)

fabric pwwn: 20:15:00:0d:ec:cd:99:80 <- NPIV interface pwwn

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