Try to trust dscp/cos value of incoming packets of the access port.
________________________________ From: ML <[email protected]> To: [email protected] Sent: Sunday, May 6, 2012 11:45 AM Subject: Re: [c-nsp] ME3400 DSCP EF bits stripped. On 5/4/2012 7:07 PM, Lee Starnes wrote: > Hello all, > > I have been banging my head against the wall for some time now trying to > figure out why the DSCP bits are being stripped and replaced with "0" on > all packets when coming from a customer connected to one of our ME3400 > switches. The switch is not doing any routing for them. It is just acting > as a L2 transport between their gear and our network. > > Customer is connected to to port FA0/24 with that port being an access > switchport. The VLAN associated with it is not an interface on the switch. > The VLAN is simply just trunked via Gig0/1 to a 6509. The customer is > setting dscp bit EF on their voice traffic and when that traffic enters the > ME3400, those bits change to 0. Is there something that needs to be set to > prevent this data from being stripped? We have monitored the traffic with > an RSPAN port and are not able to see anything other then dscp 0 on all > traffic for this interface. While I have not looked at other interfaces, I > suspect this is the same for all of them. Below is the config for this. > > > > vlan 800 > remote-span > ! > vlan 936 > ! > interface FastEthernet0/24 > description ETHERNET - Circuit ID: xxxxxxxxxxxxxx > switchport access vlan 936 > ! > interface GigabitEthernet0/1 > description uplink to 6509 > port-type nni > switchport trunk allowed vlan 32,500-520,800,936 > switchport mode trunk > load-interval 30 > speed nonegotiate > ! > monitor session 3 source interface Fa0/24 > monitor session 3 destination remote vlan 800 > > > Any ideas would be greatly appreciated. > > Thanks, > > -Lee > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ Is it possible that the 6509 is remarking traffic? Considering you are using RSPAN are you capturing traffic upstream? _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
