
Using Source Routing Bridge Services
117351-A Rev. A 2-17
Source Routing across an IP Network
This section provides details on how IP encapsulation works by tracing a
specifically routed frame as it is sent out from end station 1, traverses several
bridges and an IP network, and finally arrives at end station 2 (F
igure 2-11).
Figure 2-11. Tracking an IP-Encapsulated Frame from ES1 to ES2
To demonstrate IP encapsulation, this section traces a specifically routed frame as
it is sent out from end station 1 and arrives at end station 2:
• Example A describes the actions of the first Bay Networks bridge to handle
the SRF. This bridge encapsulates the frame with an IP header before it sends
the frame out onto the IP network.
• Example B describes the actions of a Bay Networks bridge that is in between
the first and last Bay Networks bridges to handle the SRF. This bridge
removes the IP header from the frame before it source routes the frame to the
next bridge.
Note: At this point, assume that explorer packets have traversed the network
and identified the paths to all reachable interfaces.
4
3
Internal
Internal
Bridge ID = A
group ID = FFF
LAN ID = 100
Internal
Internal
Bridge ID = A
group ID = FFF
LAN ID = 101
Internal
Internal
Bridge ID = A
group ID = FFF
LAN ID = 102
Bridge C
Example A Example B Example C
1
1.1.1.1
1.1.2.2
Bridge A
Bridge B
ES1
ES2
IP network
ring ID = 2
BRG0020A
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