[c-nsp] Gigabit link between 2960S and 4948 won't come up
Peter Subnovic
cnspmail002 at googlemail.com
Wed Jun 13 07:49:06 EDT 2012
Hi,
as a follow-up:
On the 2960S Side auto MDIX seems to be off:
2960#show controllers ethernet-controller gigabitEthernet 1/0/47 phy detail
| include MDIX
Auto-MDIX : Off [AdminState=1 Flags=0]
On the 4948 it should be on:
According to:
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/46sg/configuration/guide/sw_int.html#wp1071819
Auto-MDIX is enabled per default, but i couldn't find any information in
the "show int" output, which is the suggested way in the document to verify
the Auto-MDIX state.
When i am not mistaken, it must be on on the 4948 otherwise the link
shouldn't come up at all when i use a straight cable.
What makes me a little curious is that, in order for auto-MDIX to work
correctly, the speed and duplex must be set to auto, which is not the case
in my configuration.
But even if it doesn't work correctly the link shouldn't come up with the
straight cable, or am i understand something wrong?
Thanks in advance,
Kind regards,
Peter
On Wed, Jun 13, 2012 at 12:59 PM, Peter Subnovic <cnspmail002 at googlemail.com
> wrote:
> 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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>>
>
>
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