The default MTU size is 9216 bytes once jumbo frame support has been enabled on the individual port. However, on the following 10/100-based line cards, an Application Specific Integrated Circuit (ASIC) limitation requires that the MTU size be limited to 8092 bytes. Specifically, the line cards that are affected are as follows:
WS-X6248-RJ-45
WS-X6248A-RJ-45
WS-X6248-TEL
WS-X6248A-TEL
WS-X6348-RJ-45
WS-X6348-RJ-45V
WS-X6348-RJ-21
The WS-X6516-GE-TX is also affected at 100 Mbps. At 10/1000 Mbps, up to 9216 bytes can be supported. Note, however, that the WS-X6548-RJ-45 line card is not affected, as it uses newer ASICs.
Note: Jumbo Frame support is available on WS-X6101 ATM modules.