Please check my QOS config

Unanswered Question
Mar 4th, 2008

I have to give a strict priority to the IP traffic between RAD IPMUX11, but as I understand my config doesn't work (round-trip min/avg/max = 4/9/92 ms) :

2621_KRKZ#ping

Protocol [ip]:

Target IP address: 192.168.106.250

Repeat count [5]: 10000

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 10000, 100-byte ICMP Echos to 192.168.106.250, timeout is 2 seconds:

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Success rate is 100 percent (10000/10000), round-trip min/avg/max = 4/9/92 ms

2801_TRKT#show policy-map interface fastEthernet 0/0

FastEthernet0/0

Service-policy output: SHAPER

Class-map: SHAPE_TRKT (match-any)

178431579 packets, 211551221854 bytes

5 minute offered rate 2237000 bps, drop rate 0 bps

Match: access-group 165

178431585 packets, 211551221746 bytes

5 minute rate 2237000 bps

Traffic Shaping

Target/Average Byte Sustain Excess Interval Increment

Rate Limit bits/int bits/int (ms) (bytes)

75 (%) 0 (ms) 0 (ms)

7500000/7500000 45000 180000 180000 24 22500

Adapt Queue Packets Bytes Packets Bytes Shaping

Active Depth Delayed Delayed Active

- 0 178431590 1097835450 959224 1187521203 no

Queueing

Output Queue: Conversation 265

Bandwidth 7500 (kbps) Max Threshold 64 (packets)

(pkts matched/bytes matched) 1138617/1223438515

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

Service-policy : E1inIP_TRKT

Class-map: E1inIP (match-any)

138717940 packets, 205723994192 bytes

5 minute offered rate 2158000 bps, drop rate 0 bps

Match: access-group 195

138428388 packets, 205703718834 bytes

5 minute rate 2158000 bps

Match: protocol icmp

289554 packets, 20275358 bytes

5 minute rate 0 bps

Queueing

Strict Priority

Output Queue: Conversation 136

Bandwidth 2350 (kbps) Burst 58750 (Bytes)

(pkts matched/bytes matched) 235109/347943319

(total drops/bytes drops) 0/0

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

39713637 packets, 5827229108 bytes

5 minute offered rate 78000 bps, drop rate 0 bps

Match: any

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

737527 packets, 84597022 bytes

5 minute offered rate 0 bps, drop rate 0 bps

Match: any

Attachment: 
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Joseph W. Doherty Sat, 03/08/2008 - 17:14

Your attachment shows a 10 Mbps and 100 Mbps conections to the WAN cloud. Are these bandwidths actually guaranteed by the WAN provider both a cloud edge and throught the cloud? Can any other traffic be on the WAN connected links bypass the 2621s?

SludnevTN_2 Sun, 03/09/2008 - 21:34

1. Are these bandwidths actually guaranteed by the WAN provider both a cloud edge and throught the cloud? - No body knows. Provider did not answer me yet, but anyway, I want to know if my config is correct? Also I add ICMP to check if my config is correctand and as I see the ping result, it is not correct.

Can any other traffic be on the WAN connected links bypass the 2621s? - Yes, there is aprox. 2-4 Mbit/s of RDP, CIFS and HTTP.

Thank you.

Joseph W. Doherty Mon, 03/10/2008 - 04:56

"I want to know if my config is correct?"

It appears to be correct. However, it could also be ineffective, which might explain the poor ping results.

For it to be effective, all traffic has to be shaped. So, if there is other traffic that truly bypasses the router, you're priority traffic really isn't.

Second, the shaper must control the bandwidth. If the shaper's bandwidth restriction is larger than what the WAN cloud provides, congestion could form within the cloud were it might just be FIFO.

One issue that can also arise with WAN clouds, if multiple sources can send to the same destination, you'll either need to insure all combinations will not oversubscribe the egress bandwidth, or discover whether the WAN provider supports QoS beyond just FIFO and whether you can take advantage of it.

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