1. Introduction
MN700004 Rev 01
2
OSR
OSR
IPET
IPET
IPET
IPET
TGSU
TGSU
IPET-
cabinet
IPET-
cabinet
Legend:
Forwarding
Blocked
VLANs
Rapid-
STP
Rapid-
STP
3550
3550
3550
3550
Rapid-
STP
OSRs used as L2-
devices
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
3550
3550
GSR
GSR
Cisco 3550s
or
ESB26s
Cisco 3550s
or ESB26s
Cisco 3550s
or ESB26s
Figure 1-1 Example of Operational Environment for the ESB26 with L2 OSRs
OSR
OSR
IPET
IPET
IPET
IPET
TGSU
TGSU
IPET-cabinet
IPET-cabinet
Legend
Forwarding
Blocked
VLANs
Rapid-
STP
3550
3550
3550
3550
3550
3550
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
ESB26
Rapid-
STP
OSRs used as L3-
devices
Cisco 3550s or
ESB26s (possible
with L3 software)
Cisco 3550s or
ESB26s (possible
with L3 software)
Cisco 3550s or
ESB26s (possible
with L3 software)
Figure 1-2 Example of Operational Environment for the ESB26 with L3 OSRs.