Mailing List Archive: Dot1q cos marking of pppoe packets

Dot1q cos marking of pppoe packets

Nov 30, 2006, 11:47 PM

Post #1 of 4 (6741 views)

Hi!

Has anyone of you ever tried dot1q cos marking of cisco 7301 router
originated pppoe packets?

A PPPOE client is connected somewhere behind gig0/0.10. The connection
is established (ViXX up). Everything fine - ping ok! Now I send some
packets (not origined by the PPPOE server Cisco 7301, but routet by the
Cisco).

[... bba-group, ...]

policy-map OUTPUT
class-default
set cos 5

interface GigabitEthernet0/0.10
encapsulation dot1Q 10
service-policy output OUTPUT
pppoe enable group global
end

interface GigabitEthernet0/1
ip address 10.0.0.1 255.255.255.0

[... virtual-template, ...]

One should think, that _all_ packets sent by int gig0/0.10 get marked
with COS 5 but:

# sh policy-map interface

GigabitEthernet0/0.10

Service-policy output: OUTPUT

Class-map: class-default (match-any)
5 packets, 630 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
QoS Set
cos 5
Packets marked 0

How can this happen? The packets match (get counted) but not marked with
COS 5 (this is no false-counter, I checked this with a network sniffer).

When using the interface as simple IP interface, not using pppoe COS
marking works fine. And both counters correspond.

Is this the default behavior?

Any ideas?

Best regards

Christoph Loibl

--
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Ing Christoph Loibl <cl@sil.at> Senior Network Engineer
CL8-RIPE PGP-Key-ID: 0x4B2C0055 http://www.sil.at, http://pix.tix.at
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Re: Dot1q cos marking of pppoe packets [ In reply to ]

achatz at forthnet

Dec 1, 2006, 12:12 AM

Post #2 of 4 (6550 views)

Permalink

Have you tried applying the policy to the vtemplate which is defined in the bba-group?

--
Tassos

Christoph Loibl wrote on 1/12/2006 9:47 ðì:
> Hi!
>
> Has anyone of you ever tried dot1q cos marking of cisco 7301 router
> originated pppoe packets?
>
> A PPPOE client is connected somewhere behind gig0/0.10. The connection
> is established (ViXX up). Everything fine - ping ok! Now I send some
> packets (not origined by the PPPOE server Cisco 7301, but routet by the
> Cisco).
>
> [... bba-group, ...]
>
> policy-map OUTPUT
> class-default
> set cos 5
>
> interface GigabitEthernet0/0.10
> encapsulation dot1Q 10
> service-policy output OUTPUT
> pppoe enable group global
> end
>
> interface GigabitEthernet0/1
> ip address 10.0.0.1 255.255.255.0
>
> [... virtual-template, ...]
>
> One should think, that _all_ packets sent by int gig0/0.10 get marked
> with COS 5 but:
>
> # sh policy-map interface
>
> GigabitEthernet0/0.10
>
> Service-policy output: OUTPUT
>
> Class-map: class-default (match-any)
> 5 packets, 630 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: any
> QoS Set
> cos 5
> Packets marked 0
>
> How can this happen? The packets match (get counted) but not marked with
> COS 5 (this is no false-counter, I checked this with a network sniffer).
>
> When using the interface as simple IP interface, not using pppoe COS
> marking works fine. And both counters correspond.
>
> Is this the default behavior?
>
> Any ideas?
>
> Best regards
>
> Christoph Loibl
>
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Re: Dot1q cos marking of pppoe packets [ In reply to ]

cl at sil

Dec 1, 2006, 12:19 AM

Post #3 of 4 (6561 views)

Permalink

Hi Tassos!

Tassos Chatzithomaoglou wrote:
> Have you tried applying the policy to the vtemplate which is defined in
> the bba-group?

Yes. This results in

c7301(config-if)#service-policy output OUTPUT
Process 'set' action associated with class-map class-default failed:
Set cos supported only with IEEE 802.1Q/ISL interfaces

This makes sense to me. I even tried to set a qos-group within the
service-policy in in the virtual template, and then match at the dot1q
interface service-policy. This gives the same result... Packets were
correctly matched (counter increases), but cos does not get set (second
counter does not increase).

Regards

Christoph

--
SILVER SERVER \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\ \\ \
Ing Christoph Loibl <cl@sil.at> Senior Network Engineer
CL8-RIPE PGP-Key-ID: 0x4B2C0055 http://www.sil.at, http://pix.tix.at
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Re: Dot1q cos marking of pppoe packets [ In reply to ]

achatz at forthnet

Dec 1, 2006, 12:37 AM

Post #4 of 4 (6552 views)

Permalink

I guess you need newer IOS.

7200 & 12.3(18) doesn't work.
7200 & 12.2(28)SB5 works fine ;)

--
Tassos

Christoph Loibl wrote on 1/12/2006 10:19 ðì:
> Hi Tassos!
>
> Tassos Chatzithomaoglou wrote:
>> Have you tried applying the policy to the vtemplate which is defined
>> in the bba-group?
>
> Yes. This results in
>
> c7301(config-if)#service-policy output OUTPUT
> Process 'set' action associated with class-map class-default failed:
> Set cos supported only with IEEE 802.1Q/ISL interfaces
>
> This makes sense to me. I even tried to set a qos-group within the
> service-policy in in the virtual template, and then match at the dot1q
> interface service-policy. This gives the same result... Packets were
> correctly matched (counter increases), but cos does not get set (second
> counter does not increase).
>
> Regards
>
> Christoph
>
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