03-02-2019 04:52 AM
Hi Everybody,
we have two Cisco C2960C (WS-C2960C-8PC-L) connected via Gig0/1 using Ethernet cooper cable, the issue here is when i force both interfaces to Speed 100 both interfaces tear down,
any one have an explanation for such behavior, thanks to share it with us.
Switch 01 Interface configuration
=========================
SW-01(config-if)#do show run inter gig0/1
Building configuration...
Current configuration : 87 bytes
!
interface GigabitEthernet0/1
switchport mode trunk
media-type rj45
speed 100
end
SW-01(config-if)#
// Interface State
SW-01(config-if)#do show ip inter brie gig0/1
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/1 unassigned YES unset down down
SW-01(config-if)#
Switch 02 Interface configuration
=========================
SW-02(config-if)#do show run inter gig0/1
Building configuration...
Current configuration : 87 bytes
!
interface GigabitEthernet0/1
switchport mode trunk
media-type rj45
speed 100
end
SW-02(config-if)#
// Interface State
SW-02(config-if)#do show ip interface brief gig0/1
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/1 unassigned YES unset down down
SW-02(config-if)#
Thanks in advance
Saad
03-02-2019 06:54 AM
@Saad Khalil wrote:
the issue here is when i force both interfaces to Speed 100 both interfaces tear down
Depends on the cable used. When speed &/or duplex is hard coded, MDI/MDI-X is automatically disabled.
FYI: Hard-coding of speed/duplex is old school. It WAS (past tense) best practice 20 years ago. It is no longer recommended to hard code ports because it will only cause more issues and management.
03-02-2019 03:11 PM
03-05-2019 08:33 AM
03-05-2019 09:07 AM
03-05-2019 08:31 AM
03-02-2019 01:07 PM
adding to @Leo Laohoo comments, what is the use case for make Gigabit port to megabit port ?
03-05-2019 08:30 AM
03-05-2019 09:08 AM
03-05-2019 11:34 AM
yes try set auto/auto both the side, assuming these switches in the same comms or server room ?
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