Extreme Networks ExtremeWare XOS 11.3, Manual

Page: 473 / 698

Advanced ESRP Features
ExtremeWare XOS 11.3 Concepts Guide
473
Figure 51: ESRP host attach
ESRP VLANs that share ESRP HA ports must be members of different ESRP groups. Each port can have
a maximum of seven VLANs.
If you use load sharing with the ESRP HA feature, configure the load-sharing group first and then
enable HA on the group.
Other applications allow lower-cost redundant routing configurations because hosts can be directly
attached to the switch involved with ESRP. HA also requires at least one link between the master and
the slave ESRP switch for carrying traffic and to exchange ESRP hello packets.
ESRP domains that share ESRP HA ports must be members of different ESRP groups.
NOTE
Do not use the ESRP HA feature with the following protocols: STP, Ethernet Automatic Protection Switching (EAPS),
or VRRP. A broadcast storm may occur.
To configure a port to be a host port, use the following command:
configure esrp ports <ports> mode [host | normal]
ESRP Port Weight and Don’t Count
In an ESRP domain, the switch automatically calculates the port weight based on the bandwidth of the
port. ESRP uses the port weight to determine the master ESRP switch.
For load-shared ports, configure the master port in the load-share group with the port weight. A load-
shared port has an aggregate weight of all of its member ports. If you add or delete a load-shared port
(or trunk), the master load-shared port weight is updated.
If you do not want to count host ports and normal ports as active, configure the ESRP port weight on
those ports. Their weight becomes 0 and that allows the port to be part of the VLAN, but if a link
failure occurs, it will not trigger a reconvergence. With this configuration, ESRP experiences fewer state
EX_095
OSPF/BGP-4