- Bronze, 100 points or more
I am hoping for some help with a "duplex mismatch" problem I'm having.
I have 2 switches (a Catalyst WS-C2924M-XL with a WS-X2922-XL-V module, & a Catalyst WS-C1924C-EN) connected via fibre. The 2924 port is configured as "100/full" while the 1924 port is configured as "Full duplex-flow control".
I regularly get the folowing message in the 2924's log buffer:
%CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthernet2/1 (not half duplex), with JNR_LIB_SW A (half duplex).
Now as far as I can see both ends are configured for full duplex. If I configure the 1924's port to be "half duplex" the messages stop. Network performance is poor either way.
Can anyone tell me what's going wrong here, & how to fix it? Many thanks in advance for any help provided.