Pseudowire Switching
Page 174 7705 SAR OS Services Guide
The pseudowire segment between the 7705 SAR and the 7750 SR supports OAM tools as
well as BFD; however, since Node Bs are not dual-homed, OAM tools operating on this
pseudowire segment can only provide informative messages. The 7705 SAR responds to
Node B-initiated ping packets if the destination IP address is the system IP or interface IP
address of the 7705 SAR. If the IP packet does not contain a SAR destination IP address, the
7705 SAR does not respond, and instead, forwards the packet.
Figure 29 shows an example of static-simplex to dynamic-simplex pseudowire switching.
This service consists of a SAP and a spoke SDP. However, the target destination of the SDP
is not the remote PE but the pseudowire switching node. In addition, the user configures a
VLL service on the pseudowire switching node using the two SDPs.
Configuration examples can be found in Configuring PW Switching on page 215.
Figure 29: Simplex to Simplex Pseudowire Switching
Metro Ethernet
NW
Node B
20772
7705 SAR
MEN
RNC
7750 SR
MEN
ATM Cell #1
ATM Cell #N
Optional CW-1
PW Header-1
IP
Ethernet
ATM Cell #1
ATM Cell #N
Optional CW-2
PW Header-2
MPLS
Ethernet
no
change
PW segment 1
PW segment 2
Clear Channel
STM-1 ATM
S-PE
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