PBR cef or fast-switched

Answered Question
Dec 4th, 2009
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Hello,

I'm been reading up a little bit on policy based routing. One thing i'm a little bit confused about is if PBR is fast-switched by default on 12.4? Can it ever be cef switched?


Thank you.

Correct Answer by Giuseppe Larosa about 7 years 7 months ago

Hello Tomasz,


in release 12.0 PBR was fast switched and we used to add a command called ip route-cache policy.


the command is still there


http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ip_prot_indep_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1056863





now on multilayer switches PBR is CEF switched and they are able to write PBR next-hops in the TCAM tables.


on routers neflow  PBR has been introduced and requires CEF or dCEF


>> NetFlow policy routing (NPR) integrates policy routing, which enables traffic engineering and traffic classification, with NetFlow services, which provide billing, capacity planning, and monitoring information on real-time traffic flows. IP policy routing now works with Cisco Express Forwarding (CEF), distributed CEF (dCEF), and NetFlow.


http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ip_prot_indep_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1056863


And actually there is less attention to the first command described above.


Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Fri, 12/04/2009 - 11:39
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Hello Tomasz,


in release 12.0 PBR was fast switched and we used to add a command called ip route-cache policy.


the command is still there


http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ip_prot_indep_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1056863





now on multilayer switches PBR is CEF switched and they are able to write PBR next-hops in the TCAM tables.


on routers neflow  PBR has been introduced and requires CEF or dCEF


>> NetFlow policy routing (NPR) integrates policy routing, which enables traffic engineering and traffic classification, with NetFlow services, which provide billing, capacity planning, and monitoring information on real-time traffic flows. IP policy routing now works with Cisco Express Forwarding (CEF), distributed CEF (dCEF), and NetFlow.


http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ip_prot_indep_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1056863


And actually there is less attention to the first command described above.


Hope to help

Giuseppe

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