For checking the available memory on a line card, for example a WS-X6704-10GE card inserted in a Catalyst 6500 switch, first you have to attach to the DFC (Distributed Forward Card) on the line card. (Use the show module command to see the sub-modules you have on your 6500 chassis, this will also show the DFC's in each slot)
CoreSW# attach 8
where 8 is the slot number in which the line card is inserted.
CoreSW-DFC8# show version
....
cisco Catalyst 6000 (SB1121) processor with 1048576K bytes of memory
....
show version will show you the memory on the DFC. This command is useful especially when you change the DFC (DFC3A, DFC3B, DFC3BXL....etc.,) on your line card. It is recommended that the memory on the DFC on any line card in the 6500 chassis should match the RP memory in Sup720.
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