QOS problems in 6.0 DSCP now CS7 from MGC?

After confirming the proper settings on the MGC Card, save the config from EM and then reboot the MGC Card.

The configuration comes down via BootP when the card reboots.

Confirm that you are seeing the proper markings.

--
Fletch

Nortel Emergency Services PLM

Check out this month's E911 Talk podcast at Nortel E911 Talk Podcast

Is there any configuration file (like the CONFIG.INI on the MC32 cards) that can be examined on the MGC?

Otherwise, I'll have to wait until a maitenance window to try to reboot one of our MGC cards. This is happening over multiple systems and cabinets/chassis.

Curtismo - Any resolution on this issue? Short of remapping CS7?

No resolution. Our service provider is wanting me to INIT the systems just to make sure this won't fix the problem on the two systems I have locally.

I have quite a few (15+) MG1000B systems with some that have had power cycles (rural areas with long power outages through the winter storm season), and as far as I can tell by looking at my router QoS counters at the sites, they still have the problem.

If I come up with anything more I will post it.

Curtismo - How have you determined that traffic is being tagged CS7? Something you may want to investigate is whether the traffic is truly being marked this way or whether that's something your sniffer is interpreting incorrectly.

To answer bvjones questions:

- I have used both Wireshark and Network General Sniffer to sniff mirrored switch port

- In my Wireshark I am seeing the following on voice packets from the local MGC card port to a far-end MGC card port:

local MGC: Differentiated Services Field: 0xe0 (DSCP 0x38: Class Selector 7; ECN: 0x00)

reply from far-end MGC: Differentiated Services Field: 0xe0 (DSCP 0x38: Class Selector 7; ECN: 0x00)


- Call using T-1 from an IP phone to/from MGC card:

IP phone to local MGC: Differentiated Services Field: 0xb8 (DSCP 0x2e: Expedited Forwarding; ECN: 0x00) (IP phones are PROPERLY MARKING packets)

local MGC to IP phone: Differentiated Services Field: 0xe0 (DSCP 0x38: Class Selector 7; ECN: 0x00) (MGC NOT PROPERLY MARKING PACKETS)

- Routers at 15+ remote sites that WERE seeing DSCP EF-marked packets are no longer seeing these packets from the local side to my MPLS network. These sites worked properly under 4.5 prior to the upgrade to 6.0, using the same switch ports and router ports. Only difference is 6.0, and MGC cards vs SSCs and VGMC cards

- Sniffs have been taken on different switches that my MGCs are attached to, including 5510, 5520, 5650 and 8600 switch platforms. All exhibit the same DSCP packets.

The only thing I haven't done is use my Ethernet tap to really prove that my switches aren't modifying packets, but only because my security guy currently has it.

Any other information?