[cisco-bba] help with a config
Siva Valliappan
svalliap at cisco.com
Mon Sep 29 18:16:28 EDT 2003
inline
On Mon, 29 Sep 2003, james wrote:
> Thanks for clearing that up, this mixing of L2 and L3 is confusing at times. I took a few mins.
> to read the RFC and some Cisco docs. I have one provider
no worries
> who is configed differently (bridge groups or routed) and all of my other DSL is PPPoX
> or "atm route-bridged". I like the "atm route-bridged" config as it gives better security
> and control. I would like to move this one provider to "atm route-bridged", are these configs
> equalivant ?
>
> Can this:
> interface atm 4/0.100 point-to-point
> ip unnumbered ethernet 1/0
> pvc 0/32
> atm route-bridged ip
>
> ip route 172.69.5.9 255.255.255.0 interface atm 4/0.100
yes the above is a configuration for "atm route-bridged". basically
we are making an L3 forwarding decision, but encapsulating the IP frame
in a bridged 1483 PDU for transmission down the ATM PVC.
> be used in place of this:
>
> interface ATM1/ima0.2 multipoint
> description routed customer connections
> ip address aaa.253.145.129 255.255.255.128
> no ip mroute-cache
> pvc 1/37
> protocol ip aaa.253.145.130 no broadcast
> !
>
no as the above is a L3 configuration.
> and this:
>
> interface atm 4/0.100 point-to-point
> ip address 172.69.5.9 255.255.255.0
> pvc 0/32
> bridge-group 1
> atm route-bridged ip
> bridge 1 protocol ieee
>
> be used in place of this:
>
yes you can use the above config to replace the BVI config.
please note that when you do a flash cut of the config, if the end devices
are already up, they may need to relearn MAC addresses (if they changed).
so a gratuitous arp or something along the lines would help with the
convergence.
cheers
.siva
> interface ATM1/IMA0.2 multipoint
> description static DSL customers
> no ip redirects
> no ip unreachables
> no ip mroute-cache
> pvc 0/186
> protocol ip xxx.19.20.3 no broadcast
> !
> !
> bridge-group 2
> !
> !
> interface BVI2
> ip address xxx.19.20.1 255.255.255.128
> no ip unreachables
> no ip proxy-arp
> arp timeout 3600
> clns mtu 1514
> hold-queue 150 in
>
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