HP 200 Series Services And Applications page 77

5 – identifies the outging LAN segment (sync line 5)
Figure 16. Routing Designator 3
Router B (in figure 13) is the next source-routing bridge to receive the frame.
B updates A's last routing designator by changing bridge ID 0 to 1, and then
inserts the remainder of its routing designators (8–1, 6–0) in the frame's
MAC header. B then floods ARE frames onto LAN segments 3 and 6 with the
following routing designators:
The above ARE frame is transmitted onto LAN segment 3, where the frame
is eventually dropped, since LAN segment 3 does not provide a path to H2.
The above ARE frame is transmitted onto LAN segment 6; this frame passes
through transparent bridge T.
Because T (in figure 13) is a transparent bridge, it does not recognize the
routing designators in the source-routed frame. T treats the ARE frame as if
it was a transparent-bridging frame, and simply forwards the frame to router
C and the Ethernet (the frame transmitted onto the Ethernet is discarded).
Source-Routing Bridging
Outgoing Path
5–0
The bridge number in the last designator
is always set to 0.
1–1, 7–1, 5–1, 8–1, 3–0
1–1, 7–1, 5–1, 8–1, 6–0
Bridging Service
2-25