Packet switching not EFC / what is 'classification of output EAC?

Hello

I noticed a 3945-DRY with fairly high CPU load without doing much, because there are more packages switching process that the CFR switched.

To study, I did the following:

Router #sh ip cef switching statistics feature

Input characteristics IPv4 CEF:

Feature road Drop consume Punt Punt2Host gave

Access the list 24911921 0 0 14678240 0

0 0 0 0 20433673 routing policy

24911921 0 0 14678240 20433673 total

Output features IPv4 CEF:

Feature Drop consume Punt Punt2Host new i / f

Class output EAC 715266717 0 0 0 0

Total 0 0 715266717 0 0

Characteristics of post-encap IPv4 CEF:

Feature Drop consume Punt Punt2Host new i / f

IPSEC Post-encap 1 655816389 0 0 0

Total 1 655816389 0 0 0

CEF IPv4 for us offers:

Feature Drop consume Punt Punt2Host new i / f

Total                            0          0          0          0          0

Features of punt IPv4 CEF:

Feature Drop consume Punt Punt2Host new i / f

Total                            0          0          0          0          0

Features local IPv4 CEF:

Feature road Drop consume Punt Punt2Host gave

Total                            0          0          0          0          0

Punted them (= "punted" another mechanism of switching, not switched cef) packages for the feature 'EAC exit class' increase of ~ 1000 per second.

This made me wonder, what exactly is the feature 'CEC output class'. As I can see in the following output, this feature is enabled on my Tunnel Interface:

Router ip int tu0 #sh

Tunnel0 is up, line protocol is up

The Internet address is x.x.x.x/xx

Broadcast address is x.x.x.x

Address determined by non-volatile memory

MTU is 1400 bytes

Support address is not set

Transfer of directed broadcast is disabled

Multicast reserved joined groups: 224.0.0.10

Outgoing access list is not defined

Inbound access list is not defined

Proxy ARP is disabled

Local Proxy ARP is disabled

Security level is default

Split horizon is enabled

ICMP redirects are never sent

ICMP unreachable is always sent

Mask the ICMP responses are never sent

IP fast switching is enabled

Fast on the same switching interface IP is disabled

IP stream switching is disabled

IP CEF switching is enabled

Vector turbo IP CEF switching

Turbo IP vector draw

Tunnel VPN routing/Forwarding "xxx".

Quick change IP multicast is enabled

Fast switching of distributed IP multicast is disabled

Flags of IP route cache is fast, CEF

Router discovery is disabled

Output IP packet accounting is disabled

Accounting of IP access violation is disabled

TCP/IP header compression is disabled

RTP/IP header compression is disabled

Policy routing is disabled

Network address translation is disabled

BGP policy mapping is disabled

Input characteristics: process Packet Capture, check MCI, TCP adjust MSS

Characteristics of the output: classification of output of EAC, PNDH redirect, adjust EAC ranking NAT, TCP MSS, QoS preclassification

Display the characteristics of encapsulation: IPSEC Post-encap output classification

WCCP redirect outgoing is disabled

WCCP redirect incoming is disabled

WCCP redirect exclude is disabled

Someone tell me, what is "CCE output ranking" and why this is receptive used by my router?

Hello Sebastian,.

EAC is the engine of common classification. I think that its used to "match" traffic for features like qos, nat, etc.. ". Based on the "HS in you ' out, some features on the direction of the output are originally be punted packets. You can try "debug ip cef drop" for a few seconds while the meter is incremented, usually it will give a reason to punt. The most common reasons are listed below.

ACL log or log-entry option (or)

An unreachable next hop for a route (or)

A missing arp entry for a next jump (or)

Entry to arp for outside nat... etc.

Please rate this post without fault if you found it useful. *

Thank you best regards &,.

Vignesh R P

Tags: Cisco Network

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