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C H A P T E R 9
Enterprise Standby Router Protocol
Figure 16:
ESRP example using layer 2 and layer 3
redundancy
The VLAN
Sales
master switch, acting as master for VLAN
Sales
,
performs both layer 2 switching and layer 3 routing services for
VLAN
Sales
. The switch in standby mode for VLAN
Sales
performs neither, thus preventing bridging loops in the VLAN. The
switch in standby mode does, however, exchange ESRP packets
with the VLAN
Sales
master switch.
There are four paths between the VLAN
Sales
switches. All the
paths are used to send ESRP packets, allowing for four redundant
paths for ESRP communication. The bottom switches, being ESRP-
aware, allow traffic within the VLAN to fail-over quickly, as they
will sense when a master/slave transition occurs and flush FDB
entries associated with the uplinks to the ESRP-enabled VLAN
Sales
switches.
480t_019
Sales
VLAN
(master)
Sales
VLAN
(standby)
OSPF or RIP
Summary of Contents for 480T
Page 16: ...14 P R E F A C E...
Page 88: ...86 C H A P T E R 4 Configuring Switch Ports...
Page 112: ...110 C H A P T E R 5 Virtual LANs VLANs...
Page 152: ...150 C H A P T E R 8 Quality of Service QoS...
Page 166: ...164 C H A P T E R 9 Enterprise Standby Router Protocol...
Page 198: ...196 C H A P T E R 1 0 IP Unicast Routing...
Page 228: ...226 C H A P T E R 1 1 RIP and OSPF...
Page 254: ...252 C H A P T E R 1 3 IPX Routing...
Page 274: ...272 C H A P T E R 1 4 Access Policies...
Page 296: ...294 C H A P T E R 1 6 Using Web Device Manager...
Page 320: ...318 A P P E N D I X A...
Page 328: ...326 A P P E N D I X B...
Page 346: ...344 A P P E N D I X C...
Page 358: ...356 I N D E X...
Page 366: ...364 I N D E X...