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Netflow on serial interface on Cisco 1760 router?

Hi,

I was adding a Cisco 1760 router as a netflow source. Under the serial interface I was able to execute " ip flow ingress" command but "ip flow egress" command is not available. The current version of the router is C1700 Software (C1700-SV8Y-M), Version 12.2(15)T10.

What I get from the router after adding the netflow configuration is:

Router#sho ip flow export
Flow export v5 is enabled for main cache
  Exporting flows to xxx.xxx.xxx.xxx (2055)
  Exporting using source interface FastEthernet0/0.2
  Version 5 flow records
  284785 flows exported in 20967 udp datagrams
  0 flows failed due to lack of export packet
  0 export packets were sent up to process level
  0 export packets were dropped due to no fib
  1 export packets were dropped due to adjacency issues
  0 export packets were dropped due to fragmentation failures
  0 export packets were dropped due to encapsulation fixup failures
Router#sho ip flow int
Serial1/0
  ip flow ingress
Router#

 

Any ideas of why I can not add the egress command? Do you think that I need to upgrade the IOS?

Thanks a lot!