I am new to QoS and need help on configuring the same for 7206 VXR.
My test topology is as follows :
The Emulated router is configured using IXIA traffic generator using the GUI with one port sending the marked and classified traffic and the other port receving this traffic (which is as good as a CE router). 7206 VXR which is my Device under test acts as PE router here. THERE'S NO MPLS COMING INTO PICTURE RIGHT NOW. It's plain QoS Configuration wherein the Tx Port of IXIA is connected to one of the interfaces of 7206 VXR and Rx Port to the other interface of VXR.
CE(Transmitting port of Emulated router sending traffic marked with EF,AF11,AF43 and default)---7206VXR---CE(Receving port of Emulated router receving traffic). On the receving port I should be able to see the statistics of classified traffic which is not happening properly.
As mentioned earlier, I have a CE device(an emulated IXIA traffic generator) marked with EF, AF11, AF43 and Default codepoints. I have classifed and mapped this traffic on my PE router-7206 VXR. But I don't get the expected result i.e. I should be able to receive 100% of EF traffic, low drop in AF11, high drop in AF43 and loss in Default codepoints on the receiving port of Traffic Generator. Instead of this I get loss as equal w.r.t all the codepoints. I think my VXR configuration is going wrong somewhere. Following is my configuration. Would need some help on this as to reckon where exactly I am going wrong??? Would welcome some configuration tips for DSCP based QoS.
But even after doing the configuration, I faced some strange problem. The VXR behaved very strange for the load (emulated traffic) from IXIA for different frame sizes. The VXR was passing only the high frame sized traffic of IXIA (say frame size with 1518) and was dropping the low frame size traffic (with frame size of 128 or lower). Hence I changed the approach a bit and used priority queuing. And I got the desired results. Following is the configuration.
access-list 101 permit ip any any dscp ef
access-list 102 permit ip any any dscp af11
access-list 103 permit ip any any dscp af13
access-list 104 permit ip any any dscp default
priority-list 1 protocol ip high list 101
priority-list 1 protocol ip medium list 102
priority-list 1 protocol ip low list 104
priority-list 1 protocol ip normal list 103
ip address 220.127.116.11 255.255.255.0
This is fine for IPv4. But how do I do this for IPv6??? I am not really sure whether u can follow the same approach for IPv6. How do I set priority for a particular traffic class in IPv6. I was highly disppointed reading Section 7 under RFC 2460.
Would be highly thankful for any guidelines on this.
Would make sure that I rate this post with 5 stars :)
in case you can use the class based approach dscp would be matched in IPv6 packets also. The config for IPv4 and IPv6 is the same, because both use DSCP in the same manner.
Maybe you need another IOS if you have problems with the current one installed. There should be no problems with the config I posted above. But finally it is hard to judge, what went wrong without detailed knowledge about your test setup and further investigation. You did turn on CEF as already posted above?
I would suggest to test the config above for IPv6 and try to get an IOS supporting all the features you need without probs.
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