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

Wed Jun 13 06:59:06 EDT 2012

Hi James,

thanks for the (quick) reply.

Honestly, no i haven't checked auto MDIX settings, but will do, thanks for
the pointer.

I tried it with an crossover cable, but no luck.

Kind regards,
Peter

On Wed, Jun 13, 2012 at 12:49 PM, James Bensley <jwbensley at gmail.com> wrote:

> Hi Peter,
>
> Have you checked auto MDIX settings and also a cross over?
>
> Just my two pence.
> James.
>
> On 13 June 2012 11:41, Peter Subnovic <cnspmail002 at googlemail.com> wrote:
> > 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
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