[c-nsp] Gigabit link between 2960S and 4948 won't come up

[Peter Subnovic]

Dear List,

i am having a somewhat (in my opinion) odd issue.

We have an Cisco 4948 acting as our core switch running Cisco IOS Software,
Catalyst 4500 L3 Switch Software (cat4500-ENTSERVICESK9-M), Version
12.2(54)SG

We recently purchased a  WS-C2960S-48LPS-L running Cisco IOS Software,
C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(58)SE2

I am having a hard time to bring the Link up at 1 Gbit Speed between these
two devices. The Link will only come up if configure the speed to 100Mbit
and duplex to full on both sides.
My first guess was a bad (copper) cable, so i tried it with 5 different
cables but no luck. In the next step i tested it with different ports on
both side, but still no luck.

Interestingly, if  i use the same cables and connect the 2960S to an 3750G
running 12.2(55) SE4 the link comes up just fine with 1Gbit (using the same
ports). Also, if i connect the 4948 to the 3750G the link comes up fine at
1Gbit.

My Laptop also negotiates just fine to 1Gbit on the 4948 and 2960S (with
the same cables).

I am kind of lost as i am running out of ideas what could cause this
behavior.

Has someone run into this problem? Do you have any ideas what could cause
this issue, or what else i could be testing?

I appreciate every input and thanks in advance. If you need any additional
info, please don't hesitate to ask.

Below is the output of the interface configuration and what "show int" says.

Kind regards,
Peter


The Port configuration looks like the following:

C2960S:

interface GigabitEthernet1/0/47
 description ===XXX===
 switchport trunk allowed vlan 500-502,532
 switchport mode trunk
 switchport nonegotiate
 load-interval 30
 speed 100
 duplex full

4948:
interface GigabitEthernet1/47
 description ===XXX===
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 500-502,532
 switchport mode trunk
 switchport nonegotiate
 media-type rj45
 speed 100
 duplex full


Show interface brings up the following:

4948:

GigabitEthernet1/47 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet Port, address is 0018.18b7.ee2e (bia
0018.18b7.ee2e)
  Description: ===XXX===
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 4/255, rxload 4/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, link type is auto, media type is 10/100/1000-TX
  Media-type configured as RJ45 connector
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 19:23:29, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 1891000 bits/sec, 311 packets/sec
  5 minute output rate 1959000 bits/sec, 339 packets/sec
     204875190 packets input, 65988069530 bytes, 0 no buffer
     Received 325083 broadcasts (147424 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     292744855 packets output, 333704421693 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

Cisco 2960S:

GigabitEthernet1/0/47 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is a456.30e3.d0af (bia
a456.30e3.d0af)
  Description: ===XXX===
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 2/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 19:23:51, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 3709
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 796000 bits/sec, 108 packets/sec
  30 second output rate 187000 bits/sec, 132 packets/sec
     23172539 packets input, 20875225690 bytes, 0 no buffer
     Received 156759 broadcasts (156578 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 156578 multicast, 0 pause input
     0 input packets with dribble condition detected
     19788925 packets output, 7529119002 bytes, 0 underruns
     0 output errors, 0 collisions, 1 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