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C H A P T E R 9 Enterprise Standby Router Protocol
This example builds on the previous example, but eliminates the
requirement of layer 3 redundancy. It has the following features:
• An additional VLAN, Engineering , is added that uses layer 2
redundancy.
• The VLAN Sales uses three active links to each upper switch.
• The VLAN Engineering has two active links to each upper
switch.
• The switch labeled Sales + Engineering carries traffic for both
VLANs.
• The link between the Sales + Engineering switch and the Sales m
master/Engineering standby switch uses 802.1Q tagging to carry
traffic from both VLANs traffic on one link. The switch counts
the link active for each VLAN.
• The Sales standby/Engineering master switch has a separate
physical port for each VLAN connected to the third bottom
switch.
In this example, the master and standby switches are configured for
ESRP such that the VLAN
Sales normally uses the first switch and
the VLAN Engineering normally uses the second switch. This is
accomplished by manipulating the ESRP priority setting for each
VLAN for the particular switch.
Configuration commands for the first switch (Sales master/
Engineering standby) are as follows:
create vlan sales
config sales tag 10
config sales add port 1,2
config sales add port 3 tagged
config sales ipaddr 10.1.2.3/24
create vlan eng
config eng tag 20
config eng add port 4
config eng add port 3 tagged
config eng ipaddr 10.4.5.6/24
enable esrp sales
enable esrp eng
enable edp ports all
config sales esrp priority 5