I have a client with 2620XM and 1721 routers. They will be upgrading both to SP Svcs 12.4.6T. The max DRAM/Flash for the 1721 is 128/32 -- this is also the required memory for the IOS (per Feature Navigator). I cannot for the life of me find orderable spare part numbers for either the DRAM or the flash. For the 2620XM the max is 256/48 the requirement for the IOS is 192/48. (2)MEM2600XM-128D= works for the DRAM, but I can't find a part number for the flash.
I agree it's like finding a needle in the haystack. See the part numbers below. AFAIK, these appear to be the correct parts.
1721 Product literature indicates it can support up to 128/32 DRAM/flash. You can use two each of those cards. For the 2600XM flash you can get a 32+16 mb SIMM. I assume the router has 2 slots for the flash SIMM and DRAM cards.
MEM2600XM-32FS= 32MB Flash SIMM for the Cisco 2600XM
MEM2600XM-16FS= 16MB Flash SIMM for the Cisco 2600XM
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