Extreme Networks ExtremeWare XOS 11.3, Руководство пользователя

Страница: 472 / 698

Extreme Standby Router Protocol
ExtremeWare XOS 11.3 Concepts Guide
472
configure esrp esrp1 add track-iproute 10.10.10.0/24
The route specified in this command must exist in the IP routing table. When the route is no longer
available, the switch implements an ESRP failover to the slave switch.
To configure ping tracking, use the following command:
configure esrp esrp1 add track-ping 10.10.10.121 frequency 2 miss 2
The specified IP address is tracked. If the fail rate is exceeded, the switch implements an ESRP failover
to the slave switch.
ESRP Port Restart
You can configure ESRP to restart ports in the ESRP master domain when the downstream switch is
from a third-party vendor. This action takes down and restarts the port link to clear and refresh the
downstream ARP table.
To configure port restart, use the following command:
configure esrp <esrpDomain> ports <ports> restart
To disable port restart, use the following command:
configure esrp <esrpDomain> ports <ports> no-restart
If a switch becomes a slave, ESRP takes down (disconnects) the physical links of member ports that
have port restart enabled. The disconnection of these ports causes downstream devices to remove the
ports from their FDB tables. This feature allows you to use ESRP in networks that include equipment
from other vendors. After 2 seconds, the ports re-establish connection with the ESRP switch.
To remove a port from the restart configuration, delete the port from the VLAN and re-add it.
ESRP Host Attach
ESRP host attach (HA) is an optional ESRP configuration that allows you to connect active hosts directly
to an ESRP master or slave switch. Normally, the Layer 2 redundancy and loop prevention capabilities
of ESRP do not allow packet forwarding from the slave ESRP switch. ESRP HA allows configured ports
that do not represent loops to the network to continue Layer 2 operation independent of their ESRP
status.
ESRP HA is designed for redundancy for dual-homed server connections. HA allows the network to
continue Layer 2 forwarding regardless of the ESRP status. Do not use ESRP HA to interconnect devices
on the slave ESRP switch instead of connecting directly to the ESRP master switch.
The ESRP HA option is useful if you are using dual-homed network interface cards (NICs) for server
farms, as shown in
Figure 51 . The ESRP HA option is also useful where an unblocked Layer 2
environment is necessary to allow high-availability security.