02-17-2011 08:46 PM - edited 03-06-2019 03:37 PM
Sorry for the basic question, we have bought two new Catalyst 2950 switches and to uplink them I used the cross-over cable.
It was not working so I changed it to straight cables which works fine. Is it a normal behaviour. As per my knowledge, to connect 2 similar devices we have to use cross-over cables.
Thank You.
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02-18-2011 02:40 AM
Sure it can. 2960/2960S switch ports are MDI/MDI-X.
02-18-2011 02:59 AM
Yes that is absolutly normal, because both switches support the autonegotiation. If you want to learn more about the behaviour look here:
http://en.wikipedia.org/wiki/Medium_dependent_interface
greets Martin
02-21-2011 05:35 PM
Oh nuts. I'm sooooooooooooooo sorry.
The correct command is "sh interface
Switch#sh int g 2/0/48 trans properties
Diagnostic Monitoring is not implemented.
Name : Gi2/0/48
Administrative Speed: auto
Administrative Duplex: auto
Administrative Auto-MDIX: on
Administrative Power Inline: N/A
Operational Speed: auto
Operational Duplex: auto
Operational Auto-MDIX: on
Media Type: 10/100/1000BaseTX
One more thing: Do NOT configure speed and duplex setting (leave them in "auto" or default) for MDI/MDI-X to work.
02-17-2011 09:03 PM
2950 do not support MDI/MDI-X so you should use cross-over.
1. Maybe the 2nd switch is not a 2950 but a newer model. Perhaps a 2960.
2. Maybe it's not a straight-through cable. If you connect the same cable from the switch to a PC or laptop will the link go up?
02-17-2011 09:07 PM
Sorry, both are Catalyst 2960-S models. One is 24 port and the other one is 48 port.
It works fine with straight cables. Is it a normal behaviour?
02-18-2011 02:40 AM
Sure it can. 2960/2960S switch ports are MDI/MDI-X.
02-18-2011 02:59 AM
Yes that is absolutly normal, because both switches support the autonegotiation. If you want to learn more about the behaviour look here:
http://en.wikipedia.org/wiki/Medium_dependent_interface
greets Martin
02-18-2011 11:50 PM
How can verify this capability on the switch and why the cross-over cable should not work?
02-19-2011 02:05 AM
How can verify this capability on the switch
use the command "sh interface
why the cross-over cable should not work?
Cross-over or straight-through doesn't matter because the switch supports MDI/MDI-X.02-21-2011 04:41 PM
From the following output, how can I verify MDI/MDI-X capability?
SW-24#show interfaces gigabitEthernet 1/0/1 capabilities
GigabitEthernet1/0/1
Model: WS-C2960S-24TS-L
Type: 10/100/1000BaseTX
Speed: 10,100,1000,auto
Duplex: half,full,auto
Trunk encap. type: 802.1Q
Trunk mode: on,off,desirable,nonegotiate
Channel: yes
Broadcast suppression: percentage(0-100)
Flowcontrol: rx-(off,on,desired),tx-(none)
Fast Start: yes
QoS scheduling: rx-(not configurable on per port basis),
tx-(4q3t) (3t: Two configurable values and one fixed.)
CoS rewrite: yes
ToS rewrite: yes
UDLD: yes
Inline power: no
SPAN: source/destination
PortSecure: yes
Dot1x: yes
SW-24#
02-21-2011 05:35 PM
Oh nuts. I'm sooooooooooooooo sorry.
The correct command is "sh interface
Switch#sh int g 2/0/48 trans properties
Diagnostic Monitoring is not implemented.
Name : Gi2/0/48
Administrative Speed: auto
Administrative Duplex: auto
Administrative Auto-MDIX: on
Administrative Power Inline: N/A
Operational Speed: auto
Operational Duplex: auto
Operational Auto-MDIX: on
Media Type: 10/100/1000BaseTX
One more thing: Do NOT configure speed and duplex setting (leave them in "auto" or default) for MDI/MDI-X to work.
02-21-2011 05:42 PM
Alright,
What is the command to disable MDI/MDI-X feature on the interface if at all possible.
02-21-2011 05:46 PM
What is the command to disable MDI/MDI-X feature on the interface if at all possible.
For obvious reasons, the command "no mdix auto" will disable MDI/MDI-X of an interface. There is, in my experience, no global command available.02-18-2011 10:24 PM
Wow! Someone gave me a 1 star for making the right assumption!
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