Cisco 1721 router memory

aminotaaminota Member Posts: 4 ■□□□□□□□□□
in CCNA & CCENT
Which module do I need to upgrade 1721 to 128Mb or RAM?
Cisco doc Installing and Upgrading Memory in Cisco 1700 Series Routers - Cisco Systems lists only 64Mb module for 1721, but mentions that 128Mb is the maximum.
Will 128Mb for 1760 work in 1721? Did anyone try?
Also one Ebay seller claims that memory for 17xx and 26yyXM routers is interchangeable. Is there any truth to this?

Thanks!
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  • blackninjablackninja Member Posts: 385
    aminota wrote: »
    Which module do I need to upgrade 1721 to 128Mb or RAM?
    Cisco doc Installing and Upgrading Memory in Cisco 1700 Series Routers - Cisco Systems lists only 64Mb module for 1721, but mentions that 128Mb is the maximum.
    Will 128Mb for 1760 work in 1721? Did anyone try?
    Also one Ebay seller claims that memory for 17xx and 26yyXM routers is interchangeable. Is there any truth to this?

    Thanks!

    Don't know if the memory for 17xx and 26yyXM routers is interchangeable but you can get 128 MB for the 17xx: Check out
    Currently studying:
    CCIE R&S - using INE workbooks & videos

    Currently reading:
    Everything. Twice ;)
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  • aminotaaminota Member Posts: 4 ■□□□□□□□□□
    blackninja wrote: »
    Don't know if the memory for 17xx and 26yyXM routers is interchangeable but you can get 128 MB for the 17xx: Check out

    $100+ is an overkill.

    I was thinking more along the lines of this.

    And this is actually the claim that 17xx and 26yyXM memory is interchangeable.
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  • blackninjablackninja Member Posts: 385
    aminota wrote: »
    $100+ is an overkill.

    I was thinking more along the lines of this.

    And this is actually the claim that 17xx and 26yyXM memory is interchangeable.


    Everything in the UK is sooo expensive, you guys in the USA are so lucky.
    Currently studying:
    CCIE R&S - using INE workbooks & videos

    Currently reading:
    Everything. Twice ;)
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  • tierstentiersten Member Posts: 4,505
    I've used 2600XM memory in a 1720. No clue if the 1721 which is an updated 1720 is the same though.
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  • beef1218beef1218 Member Posts: 65 ■■□□□□□□□□
    I have the same question.

    What difference can it make by upgrading from 64M to 128M?
    If we buy used router without a IOS upgrade contract, how can we upgrade IOS by ourselves?
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  • aminotaaminota Member Posts: 4 ■□□□□□□□□□
    I've figured it out.

    First, 1721 comes with 64Mb of memory integrated with one empty memory slot that can take a 64Mb module. So, no need to by 128Mb module; one 64Mb module is enough.

    Second, memory modules are indeed interchangeable between 2600XMs and 1700s. Tried it successfully.
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