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Load balancing across ATM interfaces in a bridge-group.

I have two WIC-1ASDL interfaces in a 2651 running 12.3(26). Do I need to do any other magic to get load-sharing to work across the two ATM interfaces grouped into the BVI?

!

ip cef

bridge irb

!

interface ATM0/0

no ip address

no atm ilmi-keepalive

bundle-enable

dsl operating-mode auto

bridge-group 10

pvc 0/35

encapsulation aal5snap

!

!

interface ATM0/1

no ip address

no atm ilmi-keepalive

bundle-enable

dsl operating-mode auto

bridge-group 10

pvc 0/35

encapsulation aal5snap

!

interface BVI10

mac-address 0006.d780.a6a0

ip address 172.20.16.10 255.255.255.0

ip load-sharing per-packet

!

bridge 10 protocol ieee

bridge 10 route ip

!

Router#sh ip route | i 0.0.0.0

Gateway of last resort is 172.20.16.1 to network 0.0.0.0

D*EX 0.0.0.0/0 [170/5130496] via 172.20.16.1, 00:09:35, BVI10

Router#sh arp | i BVI10

Protocol Address Age (min) Hardware Addr Type Interface

Internet 172.20.16.10 - 0006.d780.a6a0 ARPA BVI10

Internet 172.20.16.1 9 0002.b3a0.0e6e ARPA BVI10

Router#

Router#sh int | i protocol|packets/sec

ATM0/0 is up, line protocol is up

5 minute input rate 7000 bits/sec, 12 packets/sec

5 minute output rate 13000 bits/sec, 19 packets/sec

ATM0/1 is up, line protocol is up

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

...

...

BVI10 is up, line protocol is up

5 minute input rate 8000 bits/sec, 12 packets/sec

5 minute output rate 11000 bits/sec, 19 packets/sec

Router#

1 REPLY
Hall of Fame Super Silver

Re: Load balancing across ATM interfaces in a bridge-group.

Hello Jason,

if STP is blocking the second ATM you cannot achieve load-balancing in this way.

verify with show spanning-tree the state of the two atm ports chances are that the second is not in forwarding state.

I would use two separate bridge-groups and two distinct BVIs. Then you add a second default static route using the second BVI so you can get load-balancing at L3.

Hope to help

Giuseppe

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