Here is the DLSW config from an L3 CatOS swtich Im working on.
bridge 1 protocol ieee
bridge 2 protocol ieee
bridge 3 protocol ieee
bridge 4 protocol ieee
bridge 5 protocol ieee
bridge 6 protocol ieee
bridge 7 protocol ieee
description Server VLAN73
ip address 10.0.16.2 255.255.255.0 secondary
ip address 10.27.73.2 255.255.255.0
no ip redirects
no ip unreachables
ipx input-network-filter 902
ipx input-sap-filter 1002
ipx encapsulation SAP
ipx network A1B4900
ipx output-gns-filter 1050
standby 16 ip 10.0.16.1
standby 16 timers 5 15
standby 16 priority 175
standby 16 preempt
standby 73 ip 10.27.73.1
standby 73 timers 5 15
standby 73 priority 175
standby 73 preempt
bridge-group 1 input-address-list 702
dlsw local-peer peer-id 10.27.13.1
dlsw remote-peer 0 tcp 10.27.2.1
dlsw remote-peer 0 tcp 10.27.1.1
dlsw bridge-group 1
dlsw bridge-group 2
dlsw bridge-group 3
dlsw bridge-group 4
dlsw bridge-group 5
dlsw bridge-group 6
dlsw bridge-group 7
Its very straightforward. Nothing weird about it, except that this is the only interface in this bridge group. There are also 2 other SVIs that are put into 2 different bridge groups, too. So, what we have are 3 SVIs with each of them being placed in 3 different bridge groups.
Thats what is confusing me. Whats the point of only putting one vlan in a bridge group? i thought the point of the group is to be able to bridge (pass) traffic between machines on different network segments that are running non-routable protocols, like SNA, etc.
In other words, I would expect to see 2, 3 or more SVIs being placed in the same bridge group so that devices on each of those vlan can pass traffic between each other.
what am I missing?
SEE THE ATTACHED DIAGRAM AND NOTICE HOW SEVERAL VLANS ARE PUT IN A BRIDGE GROUP.
Your question is a very good representation of the traditional use of bridge-group where you use it to enable bridging between several segments on the local device. But in looking at the configuration it becomes obvious that the bridge-group is being used for something else. The best clue is this:
dlsw bridge-group 1
which shows that the bridge-group is being used to get non-routed traffic (like SNA) and put it into DLSW so that it can be sent to a remote peer (DLSW encapsulates the bridged traffic in IP datagrams for transport over the IP network) and on the remote peer that traffic will be bridged to its destination.
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