Home Vendor Cisco [Cisco] How to Check CEF (Cisco Express Forwarding)

Cisco Express Forwarding (CEF) is advanced Layer 3 IP switching technology. CEF optimizes network performance and scalability for networks with large and dynamic traffic patterns, such as the Internet, on networks characterized by intensive Web-based applications, or interactive sessions.

CEF offers these benefits:

  • Improved performance
  • Scalability
  • Resilience

Although you can use CEF in any part of a network, it is designed for high-performance, highly resilient Layer 3 IP switching.

 

Cisco Router#sh cef linecard
CEF table version 251092, 1027 routes
Slot CEF-ver MsgSent XdrSent Seq MaxSeq LowQ MedQ HighQ Flags
1 251092 531724 555310 18901 18925 0 0 0 up, sync
2 251092 531724 555309 18901 18925 0 0 0 up, sync
4 251092 531724 555308 18901 18925 0 0 0 up, sync
5 251092 531724 555310 18901 18925 0 0 0 up, sync
7 251092 531724 555322 18901 18925 0 0 0 up, sync
Cisco Router#

- To restart CEF, try below command. After that, check memory so the router won't crash

no ip cef distributed
ip cef distributed

 

Cisco Router(config)#no ip cef distributed
Cisco Router(config)#ip cef distributed


 

Reference ; http://www.cisco.com/en/US/docs/ios/12_0/switch/configuration/guide/xccef.html

Last Updated (Friday, 22 May 2009 18:52)

 
Smart Link
Search
Statistics
Content View Hits : 2124906
Related Items
Polls
Highly recommended firewall vendor?
 
Google Translation
English Arabic Chinese (Simplified) Czech Dutch French German Italian Korean Portuguese Russian Spanish Filipino Vietnamese Thai Turkish
BGP routing issue?
Banner
World Route Servers
Banner
Who's Online
We have 51 guests online