cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
469
Views
0
Helpful
5
Replies

Policy Map Matching Packets Not Prioritizing

tom.gabriel
Level 1
Level 1

My policy map is looking for the dsc 5 for my Toshiba phone system to prioritize our inter VoIP. Packets are being matched, but not prioritized. I have allotted 384K for voice. The smallest pipe it travels through is 3 Megabit. I can't tell if the voice is needing prioritized, but the phone conversations break up and drop packets. Any ideas of where to look?

5 Replies 5

Edison Ortiz
Hall of Fame
Hall of Fame

Please post the relevant portion of the config along with the show policy-map interface output.

__

Edison.

Carbondale_Tower_CSI#sho policy-map interface vlan 107

Vlan107

Service-policy output: voice

Class-map: voice (match-any)

946947 packets, 202646658 bytes

5 minute offered rate 18000 bps, drop rate 0 bps

Match: ip dscp cs5

946947 packets, 202646658 bytes

5 minute rate 18000 bps

Queueing

Output Queue: Conversation 265

Bandwidth 384 (kbps) Max Threshold 64 (packets)

(pkts matched/bytes matched) 0/0

(depth/total drops/no-buffer drops) 0/0/0

Class-map: class-default (match-any)

5754431 packets, 1679667342 bytes

5 minute offered rate 47000 bps, drop rate 0 bps

Match: any

Queueing

Flow Based Fair Queueing

Maximum Number of Hashed Queues 256

--More-- (total queued/total drops/no-buffer drops) 0/0/0

Carbondale_Tower_CSI#sho policy-map voice

Policy Map voice

Class voice

Bandwidth 384 (kbps) Max Threshold 64 (packets)

Class class-default

Flow based Fair Queueing

Bandwidth 0 (kbps) Max Threshold 64 (packets)

Carbondale_Tower_CSI#

Here is my policy-map output and my policy map. My toshiba phone system using dscp of cs5.

Thanks

You aren't using priority (LLQ), you are using bandwidth which is quite different.

Bandwidth only kicks in during congestion and from the policy-map output, you haven't hit congestion. However, you don't want to place voice packets on regular queues as they tend to be dropped on any bursty situation. There is a reserved queue for things like that, it's called the priority queue.

Your policy map should look like this:

policy-map voice

class voice

priority 384

class class-default

.....

.....

....

HTH,

__

Edison.

hi edison,

how you confirmed from the output

there is no congestion

Bandwidth only kicks in during congestion.

You presented this output where the ACL is being matched (Note the maximum offered is 18kbps).

Class-map: voice (match-any)

946947 packets, 202646658 bytes

5 minute offered rate 18000 bps, drop rate 0 bps

Match: ip dscp cs5

946947 packets, 202646658 bytes

5 minute rate 18000 bps

Now this is the portion where the Queueing kicsk in:

Queueing

Output Queue: Conversation 265

Bandwidth 384 (kbps) Max Threshold 64 (packets)

(pkts matched/bytes matched) 0/0

(depth/total drops/no-buffer drops) 0/0/0

As you see, no packets are being allocated here since there isn't any congestion.

__

Edison.

Review Cisco Networking products for a $25 gift card