[c-nsp] disabling GigE negotiation on NX-OS

Fri Apr 15 16:44:03 EDT 2011

testing in my lab now -- simple back to back copper over glc-t between 
n5020 running 4.2(1)n2(1) and asr1002 running 3.1.0s

=========================================================================================
asr1002-1#sh run int gig 0/0/3
Building configuration...

Current configuration : 74 bytes
!
interface GigabitEthernet0/0/3
  no ip address
  no negotiation auto
end

asr1002-1#sh int gig 0/0/3
GigabitEthernet0/0/3 is up, line protocol is up
   Hardware is 4XGE-BUILT-IN, address is 588d.09ef.5103 (bia 588d.09ef.5103)
   MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
      reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation ARPA, loopback not set
   Keepalive not supported
   Full Duplex, 1000Mbps, link type is force-up, media type is T
   output flow-control is on, input flow-control is on
   ARP type: ARPA, ARP Timeout 04:00:00
   Last input 00:00:00, output never, output hang never
   Last clearing of "show interface" counters never
   Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
   Queueing strategy: fifo
   Output queue: 0/40 (size/max)
   5 minute input rate 0 bits/sec, 0 packets/sec
   5 minute output rate 0 bits/sec, 0 packets/sec
      37 packets input, 5077 bytes, 0 no buffer
      Received 0 broadcasts (0 IP multicasts)
      0 runts, 0 giants, 0 throttles
      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
      0 watchdog, 37 multicast, 0 pause input
      0 packets output, 0 bytes, 0 underruns
      0 output errors, 0 collisions, 4 interface resets
      0 unknown protocol drops
      0 babbles, 0 late collision, 0 deferred
      0 lost carrier, 0 no carrier, 0 pause output
      0 output buffer failures, 0 output buffers swapped out

----------------------------------------------------------------------------------------

n5020-1# sh run int e1/1

!Command: show running-config interface Ethernet1/1
!Time: Fri Apr 15 20:46:47 2011

version 4.2(1)N2(1)

interface Ethernet1/1
   speed 1000

n5020-1# sh int e1/1
Ethernet1/1 is up
   Hardware: 1000/10000 Ethernet, address: 0005.73a1.6508 (bia 
0005.73a1.6508)
   MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
      reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation ARPA
   Port mode is access
   full-duplex, 1000 Mb/s, media type is 1/10g
   Beacon is turned off
   Input flow-control is off, output flow-control is off
   Rate mode is dedicated
   Switchport monitor is off
   Last link flapped 00:01:54
   Last clearing of "show interface" counters 00:03:58
   30 seconds input rate 0 bits/sec, 0 packets/sec
   30 seconds output rate 232 bits/sec, 0 packets/sec
   Load-Interval #2: 5 minute (300 seconds)
     input rate 0 bps, 0 pps; output rate 32 bps, 0 pps
   RX
     0 unicast packets  0 multicast packets  0 broadcast packets
     0 input packets  0 bytes
     0 jumbo packets  0 storm suppression packets
     0 runts  0 giants  0 CRC  0 no buffer
     0 input error  0 short frame  0 overrun   0 underrun  0 ignored
     0 watchdog  0 bad etype drop  0 bad proto drop  0 if down drop
     0 input with dribble  0 input discard
     0 Rx pause
   TX
     0 unicast packets  46 multicast packets  0 broadcast packets
     46 output packets  6528 bytes
     0 jumbo packets
     0 output errors  0 collision  0 deferred  0 late collision
     0 lost carrier  0 no carrier  0 babble
     0 Tx pause
   1 interface resets
=========================================================================================

the asr is as "carrier" as i get -- and i don't have a 5548 to dink 
with, so take this for what its worth, but i think that tony is spot on.

q.

==
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On 04/15/2011 12:28 PM, Tony Varriale wrote:
> On 4/15/2011 1:07 PM, Gert Doering wrote:
>> Hi,
>>
>> yesterday, one of our customers tried to move two GigE-on-fiber circuits
>> from a Catalyst 4507 to a new Nexus 5548.
>>
>> The other end terminates on some carrier gear (and is then multiplexed
>> in whatever ways across the city).
>>
>> After moving the circuit, the link didn't come up on the Nexus, but
>> the carrier gear *did* show link. I wasn't on-site, so I couldn't
>> investigate myself, but it smells very much like "GigE link negotiation
>> being disabled on the carrier gear" - carriers love that.
>>
>> Of course we do not have access to either the Catalyst nor the Nexus,
>> but it's "our duty" to "make it work" (after all, we provide the fiber
>> patches!). So I'd like him to test disabling link negotiation on the
>> Nexus, but don't know how to do that - no access to any NX-OS gear yet.
>>
>> On CatOS, this is "set port negotiation x/y disable".
>>
>> On IOS, it's "int giga x/y / speed nonegotiate".
>>
>> --> How to do it on NX-OS?
>>
>> http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli_rel_4_0_1a/BasicEthernet.html
>>
>>
>> refers to "Layer 1 autonegotiation", but no word on turning it off...
>>
>> gert
>>
>>
>> _______________________________________________
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>> https://puck.nether.net/mailman/listinfo/cisco-nsp
>> archive at http://puck.nether.net/pipermail/cisco-nsp/
> Hmmm interesting. Force it? speed 1000.
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