01-25-2008 07:22 AM - edited 03-05-2019 08:42 PM
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?
01-25-2008 07:54 AM
Please post the relevant portion of the config along with the show policy-map interface output.
__
Edison.
01-25-2008 12:32 PM
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
01-25-2008 12:57 PM
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.
01-25-2008 10:09 PM
hi edison,
how you confirmed from the output
there is no congestion
01-26-2008 07:43 AM
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.
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