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8-10 Cisco BPX 8600 Series Reference
Extended Services Processor
Figure 8-6 ESP Redundant Pair
Y-Cable Redundancy
The WAN Service Node provides another form of ESP redundancy protection through the use of
Y-cables. With Y-cables, the ESP ATM NIC can be connected to two BXM cards or two BXM ports,
as shown in Figure 8-7. This prevents the failure of a BXM card or port from disabling the ESP.
Figure 8-7 ESP Y-Cable Redundancy
Ethernet
Ethernet
ESP 1
ATM
NIC
10BaseT
SV+
LAN
BXM
BXM
BPX 8620
ASC
BXM
BXM
10BaseT
10614
BNM
MGX 8220
A/B
Ethernet
ESP 2
ATM
NIC
A/B
OC-3 OC-3
WAN Service Node
Ethernet
ESP
ATM
NIC
BPX Service Node
10Base-T
SV+
LAN
BXM
BNI/
BXM
BPX
ASC
BXM
10615
BNM
MGX
A/B
OC-3 MMF
Y - Cable