Two NM-GE1 on 3825 ISR ?

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Feb 14th, 2010
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Hello..


Here (http://www.cisco.com/en/US/prod/collateral/modules/ps2797/ps4908/product_data_sheet09186a008010fbd7.html) is said

that maximum Cisco gigabit ethernet network module support for 3825 is 1 module only.

And here (http://www.cisco.com/en/US/prod/collateral/routers/ps5855/product_data_sheet0900aecd8016a8e8.html) is said

that for 3825 maximum number of network modules, NMEs, and NME-Xs  - is 2 modules.


What the real situation with NM capacity on 3825 is ?


I need to form an 2 gbit/s etherchannel from two 3750 (in stack) to 3825. It's ipossible with onboard 3825 Ge interfaces, so I need modules...


tnx


wbr, Alex

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Giuseppe Larosa Sun, 02/14/2010 - 04:55
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Hello Alex,

it will never work well


even if you could install two NM GE on the C3825, the C3825 works in software and it not able to handle the load of even one single GE.


one GE full rate means 1480000 pps per direction (smallest size 64 bytes frames)


A 3825 is able to handle 350000 pps with CEF.


Also port channels on routers are not a good idea.

Other colleagues have reported problems in attempting to use two 2GE bundles on a C7201 with 4 GE ports.


see the attached file for performances with raw data (no features applied)


Use two routed L3 links instead of port-channel. Use subinterfaces on the existing GE ports it is a reasonable solution.


Hope to help

Giuseppe

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