3750 impressions

[crysm]

Hello,

Sorry for cross-posting with the LAN switching and routing forums but I've realised only now that perhaps this is the right forum.

We are planning o build a switched network using 3750G-24TS-S1U switches.

Reading through the documentation I have observed that it suppports 9000 bytes Jumbo frames only on the GE ports.

But it is not clear wheter it is supported only on the SFP or it is supported also on the 10/100/1000 Ethernet ports when they are working in 1000 Ethernet mode.

Also has anybody tested wheter you can achieve full line rate on lets say 10 ports running at the 1000 bit/s speed ?

Thank you

[smalkeric]

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.