Specifications

Clarifications, Known Behaviors, and Problems
ExtremeWare v6.2.1 Release Notes Page 29
features associated with ExtremeWare v6.1. These include route tracking and the ability to modify the
election algorithm.
Mixing Clients and Routers on an ESRP-Enabled VLAN
ESRP should not be enabled on a VLAN that is also expected to exchange routes with other non-ESRP
routers (e.g.: routers using RIP or OSPF). ESRP is intended and designed as a Layer 2 or Layer 3
redundancy method for clients with a single default route. ESRP’s fail-over operation may interfere with
normal routing protocol communication if an ESRP-enabled VLAN contains other routers not using
ESRP (4874).
Ensure that EDP is Enabled
The Extreme Discovery Protocol must be enabled on the ports involved with ESRP in order to function
correctly. By default EDP is enabled on all ports. To verify this, use the command “
sh port
<portlist> info
”. To enable EDP on a port, use the command “enable edp ports <portlist>”
(4072).
ESRP and Host Attached Ports
Any ESRP VLANs that share ESRP host attached ports must be in different ESRP Groups.
ESRP and Bi-Directional Rate Shaping
When a single ESRP VLAN is configured with bi-directional rate shaping ports and no direct physical
connection to the 2
nd
ESRP router, the ESRP slave router flips back and forth to Master state. If a
second rate-shaped VLAN or a direct link between the 2 ESRP routers exists, this will not occur (10739).
When ESRP and bi-directional rate shaping are configured simultaneously on the same switch, rate
shaping traffic to the ESRP MAC address will not take effect until the switch is rebooted (13583).
ESRP and SLB Health Check
In some situations when a ESRP transition occurs and SLB health checking is enabled, the new ESRP
master may send out SLB ping health checks, which may cause a very brief broadcast storm on the
network (10-20 msecs). Disabling the SLB health checks will prevent this problem (1-9VHPA/1-9VHOP)
Gigabit Port Restart
When an ESRP master transitions to a slave, it does not send out a port restart on a gigabit port. It
sends out the port restart only after it transitions back to master. This can cause a brief set of transitions
between the master and save switches. (1-9W4SH/1-9W4R9)
IP Unicast Routing
VLAN Aggregation
Moving a sub-VLAN Client. When a client is moved from one sub-VLAN to another, the client may
not be able to ping or communicate through the super-VLAN until the client has cleared its IP ARP
cache for the default router or the switch has that IP ARP cache entry cleared (4977).