QOS for RFC 1483 Bridged DSL

[alexd12]

Is there any way to set up a Cisco 877 router to do QOS for a RFC 1483 bridged DSL connection?

[s-doyle]

Unfortunately, qos is not supported on a bvi interface. If we want to do qos on this router, we need to make it a layer 3 router.

http://www.cisco.com/en/US/products/hw/routers/ps380/products_qanda_item0900aecd8028a982.shtml

[wochanda]

You can't configure QoS on a router configured for 1483 bridging with IRB (BVI interface), but you can configure it when you use RBE (route-bridge encapsulation).

Check out this example:

interface atm0/0

ip address 10.10.10.2 255.255.255.0

service-policy output llq

atm route-bridge ip

no atm ilmi-keepalive

pvc 0/35

encapsulation aal5snap

vbr-nrt 320 320

tx-ring-limit 5

protocol ip 10.10.10.1 broadcast

!

[alexd12]

The customer uses the DSL connection to provide internet access for their LAN. With RBE is it possible to provide NAT for the LAN?

[wochanda]

Sure, the 'ip nat outside' will go on the ATM subinterface, just like with a Layer3 routed config.

[alexd12]

When I try to use RBE with nat outside on the ATM inteface or subinterface I get the error

%NAT: Error activating cnbar on the interface ATM0

Cisco TAC said I cannot use RBE for this and should try to get a different connection type.