ip accounting precedence for non-transit traffic

ip accounting precedence for non-transit traffic
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Subject Author Date
ip accounting precedence for non-transit traffic marko 05-25-2008
Posted by marko on May 25, 2008, 5:23 pm
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In my home study lab, I'm finding that the 'ip accounting precedence
output' and 'show int e0/0 precedence' commands do not work as
expected when the same router is the one generated the traffic you're
hoping to capture.

What I was doing was using a policy-map to set the IP Precedence to 5
of generated ping packets and the 'show policy-map int e0/0' command
showed that these markings were being set. However, the 'show int e0/0
precedence' output showed this traffic as precedence 0 instead of 5.
So, although I can't find this written anywhere, it appears that if
the capturing and generating router are the same, the show output
won't have show the markings on the packets. This is what I'm
gathering from my experiments. Can anyone comment or corroborate
that?

thanks -

NMFall 20%
Posted by Scott Perry on May 29, 2008, 12:46 pm
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Verify first that the router really is marking the IP precedence of that
traffic to 5. It is one thing to apply a policy-map to an interface when
the traffic is coming from outside of a router versus this situation where
the router is generating the traffic. Also try an extended PING command
where you specify the source IP address of the PING to help match whatever
your policy map has, if applicable.

!
access-list 2001 remark *
access-list 2001 remark * Declaring ICMP (including PING) to 10.10.10.10 for
QoS
access-list 2001 remark *
access-list 2001 permit icmp any host 10.10.10.10
!
class-map match-any ICMPclass
description * Classification of ICMP traffic to 10.10.10.10
match access-group 2001
!
policy-map ICMPtagging
description * Mark ICMP to 10.10.10.10 as IP Presedence 5
class ICMPclass
set ip precedence critical
!
interface Ethernet1
service-policy input ICMPtagging
interface Ethernet0
service-policy output ICMPtagging
!

-----

Scott Perry
Indianapolis, IN

-----

> In my home study lab, I'm finding that the 'ip accounting precedence
> output' and 'show int e0/0 precedence' commands do not work as
> expected when the same router is the one generated the traffic you're
> hoping to capture.
>
> What I was doing was using a policy-map to set the IP Precedence to 5
> of generated ping packets and the 'show policy-map int e0/0' command
> showed that these markings were being set. However, the 'show int e0/0
> precedence' output showed this traffic as precedence 0 instead of 5.
> So, although I can't find this written anywhere, it appears that if
> the capturing and generating router are the same, the show output
> won't have show the markings on the packets. This is what I'm
> gathering from my experiments. Can anyone comment or corroborate
> that?
>
> thanks -



Posted by marko on May 30, 2008, 4:44 pm
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> Verify first that the router really is marking the IP precedence of that
> traffic to 5. It is one thing to apply a policy-map to an interface when
> the traffic is coming from outside of a router versus this situation where
> the router is generating the traffic. Also try an extended PING command
> where you specify the source IP address of the PING to help match whatever
> your policy map has, if applicable.
>
> !
> access-list 2001 remark *
> access-list 2001 remark * Declaring ICMP (including PING) to 10.10.10.10 for
> QoS
> access-list 2001 remark *
> access-list 2001 permit icmp any host 10.10.10.10
> !
> class-map match-any ICMPclass
> description * Classification of ICMP traffic to 10.10.10.10
> match access-group 2001
> !
> policy-map ICMPtagging
> description * Mark ICMP to 10.10.10.10 as IP Presedence 5
> class ICMPclass
> set ip precedence critical
> !
> interface Ethernet1
> service-policy input ICMPtagging
> interface Ethernet0
> service-policy output ICMPtagging
> !
>
> -----
>
> Scott Perry
> Indianapolis, IN
>
> -----
>

Thanks... those are good ideas...


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