From: Ben (ccieben@cox.net)
Date: Sat Feb 24 2007 - 19:35:29 ART
Hi Bob & GS,
I'm just wondering if you could help clarify something for me.
Would it be true that the only time "switchport priority extend cos" has
a real value, is if the PC attached to the phone had formed a Dot1Q
trunk to the phone?
I appreciate your insight...
Thanks.
Ben
Bob Sinclair wrote:
> Hi Maxim,
>
> Isn't the PC traffic coming into the switch untagged on access VLAN 5? If
> so, then it cannot be carrying any CoS value. If it is coming untagged, how
> about setting the default CoS on the switchport to 4?
>
> HTH,
>
> Bob Sinclair
> CCIE 10427 CCSI 30427
> www.netmasterclass.net
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Maxim Kurushkin
> Sent: Thursday, December 14, 2006 12:52 PM
> Cc: Cisco certification
> Subject: Questions about mls qos
>
> Good day, Group.
> I have 3560+Cisco IPPhone7960 and 7970 + router +PC.
> Router <--> Switch <---> Phone <---> PC (Windows)
> I send ping from PC to router and want to remark it to IP Prec 4.
>
> mls qos
> interface FastEthernet0/17
> switchport access vlan 5
> switchport mode access
> switchport voice vlan 9
> switchport priority extend cos 4
> mls qos trust device cisco-phone
> mls qos trust cos
> spanning-tree portfast
> All maps with default configurations.
>
> PC's IP 30.0.0.1
> Router's IP 30.0.0.2
>
> Do ping and see on Router:
>
>
> R2851#sh interfaces gig 0/0 precedence
> GigabitEthernet0/0
> Input
> Precedence 0: 316 packets, 25283 bytes
>
> interface GigabitEthernet0/0
> ip address 30.0.0.2 255.255.255.128
> ip accounting precedence input
>
> I have tried 7960 and 7970 - the same results...
> Why command "switchport priority extend cos 4" is not remark traffic
> from PC? Any ideas?
>
> WBR,
> Maxim
>
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