The fallacy in this illustration is that there are no such 'multiport' SRBs.
Source Route Bridges are by definition 2-port devices; therefore, each
bridge as indicated would require a virtual internal ring. However, for the
sake of argument, let's assume there were such devices.
The All-Routes Explorer from Host A will send out one frame that gets
replicated by each bridge in the network and sent out every one of its
ports. In your topology, put a virtual ring between the remote bridges for
sake of illustration.
Host A has a route to Host B via these unique routes:
Ring1 Bridge1 VirtualRing12 Bridge2 Ring2
Ring1 Bridge3 VirtualRing34 Bridge4 Ring2
Ring1 Bridge1 VirtualRing14 Bridge4 Ring2
Ring1 Bridge3 VirtualRing32 Bridge2 Ring2
R1 B3 VR32 B2 VR12 B1 VR14 B4 R2
To:
Sent: Tuesday, May 01, 2001 1:57 PM
Subject: Bridging in Token ring environment [7:2804]
> Hi All,
>
> In following Token ring environment if hostA sends an
> explorer packet to find address and route information
> of HostB then how many explorer packets are received
> at HostB? What I read so far from the books the answer
> is 6. Correct me if I am wrong. Also does it matter
> what kind of bridging protocol in use such SRB, RSRB,
> DLSw etc for NetBIOS or SNA traffic.
>
>
> /-----Bridge1--Bridge2\
> / \ / \
> HostA----Ring1 \ / Ring2--HostB
> | \ / |
> | \/ |
> | /\ |
> | / \ |
> | / \ |
> |----Bridge3---Bridge4----|
>
> Thanks,
>
>
>
>
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