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New Member

QOS for RFC 1483 Bridged DSL

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

5 REPLIES
New Member

Re: QOS for RFC 1483 Bridged DSL

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

Silver

Re: QOS for RFC 1483 Bridged DSL

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

!

New Member

Re: QOS for RFC 1483 Bridged DSL

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

Silver

Re: QOS for RFC 1483 Bridged DSL

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

New Member

Re: QOS for RFC 1483 Bridged DSL

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.

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