HP 200 Series Services And Applications page 79

Source-Routing Bridging on HP Routers
This section describes the routing of frames through a network using HP's
source-routing architecture. The HP router configured as a source-routing
bridge handles incoming packets differently depending on its position in the
network. The sample network shown below in figure 17 contains bridging
HP routers and two end nodes (H1 and H2). The internal LAN ID, group LAN
ID, and bridge ID are listed for each bridge in column below the bridge
illustrated. Ring 1 has a LAN ID of 1; ring 2 has a LAN ID of 2; ring 3 has a
LAN ID of 3; ring 4 has a LAN ID of 4; ring 5 has a LAN ID of 5. This is the
sample network used in the subsequent illustrations throughout this section,
figures 18 through 23. An HP router that is performing source-routing
bridging is referred to as a "bridge" in this section.
1
router A
H1
Internal LAN ID = 100
Group LAN ID = FFF
Bridge ID = A
Figure 17. Sample HP Source-Routing Bridging Network
The following three subsections describe three tracks, listed below, taken by
source-routing frames in the sample network shown in figure 17. The subsec-
tion for each track gives different scenarios for bridges in the different
network positions—first, middle, and last—describing how they manipulate
the frame's Routing Information Field (RIF).
1. Track the RIF of an explorer frame (ARE) sent from H1 to H2.
2. Track the RIF of the specifically routed frame (SRF) sent back from
H2 to H1.
3. Track the RIF of a specifically routed frame (SRF) sent from H1 to
H2.
3
2
router B
Internal LAN ID = 101 Internal LAN ID = 102
Group LAN ID = FFF Group LAN ID = FFF
Bridge ID = A Bridge ID = A
Bridging Service
Source-Routing Bridging
4
router C H2
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