User guide

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10-3
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If you configure OSPF and ESRP, you must manually configure an OSPF router
identifier (ID). Be sure that you configure a unique OSPF router ID on each
switch running ESRP. For more information on configuring OSPF, refer to
Chapter 12.
To have two or more switches participate in ESRP, the following must be true:
• For each VLAN to be made redundant, the switches must have the ability to
exchange packets on the same layer 2 broadcast domain for that VLAN. Multiple
paths of exchange can be used, and typically exist in most network system designs
that take advantage of ESRP.
• In order for a VLAN to be recognized as participating in ESRP, the assigned IP
address or the IPX NETid for the separate switches must be identical. Other aspects
of the VLAN, including its name, are ignored.
• ESRP must be enabled on the desired VLANs for each switch.
ESRP cannot be enabled on the VLAN default .
• Extreme Discovery Protocol (EDP) must be enabled on the ports that are members of
the ESRP VLANs (The default setting is enabled.).
To verify EDP status, use the following command:
show ports <portlist> info {detail}
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ETERMINING THE
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The ESRP master switch (providing layer 3 routing and/or layer 2 switching services
for a VLAN) is determined by the following factors:
• Active ports—The switch that has the greatest number of active ports takes highest
precedence. A load-sharing port group is considered a single port.
• Tracking information — Various types of tracking are used to determine if the
switch performing the master ESRp function has connectivity to the outside world.
ExtremeWare supports the following types of tracking:
— VLAN – Tracks any active port connectivity to one or more designated VLANs
— IP route table entry – Tracks specific learned routes from the IP route table
— Ping – Tracks ICMP ping connectivity to specified devices