1500
ExtremeWare 7.5 Command Reference Guide
ESRP Commands
ELSM uses two types of hello packets to communicate the health of the network to other ELSM ports.
•
Hello+ — The device receives a hello from the neighbor device, and no problem is detected
•
Hello- — The device does not receive a hello from the neighbor device, or the device has
experienced a critical event.
Use the following command to specify the time, in seconds, between consecutive ELSM hellos:
configure elsm hellotime <1-128> ports <portlist>
Table 28 describes the ELSM timers that are derived from other timers and are not user-configurable.
The ELSM receive port receives hello messages from its peer. The ELSM receive states are:
•
Down—Port is down.
When you enable ELSM, the starting state is Up. If it does not receive a Hello message from its
neighbor before the Up timeout, it transitions to the Down state. When ELSM is down, data packets
are neither received nor transmitted out of that port.
•
Down-Wait—Transitional state.
When the port enters the Down-Wait state, the Down timer begins. After the timer expires, the port
checks the number of Hello+ packets received against the configured down threshold. If the Hello+
packets are greater than or equal to the threshold, the port transitions to the Up state. If the Hello+
packets are less than the threshold, the port returns to the Down state and begins the process again.
•
Up—Beginning state, port is up.
If ELSM is enabled and the port enters the Up state, the Up timer begins. Each time the port receives
a Hello+ packet, the timer restarts and remains in the Up state.
If the port no longer receives hello packets for Up-timer seconds, or receives a hello- packet, the port
transitions to either the Down or Down-Stuck state.
Table 28:
Derived timers
Timer
Description
Down
Specifies the time it takes for the ELSM receive port to cycle through the following states:
•
Down
•
Down-Wait
•
Up
If the Hello timer is set to 1 seconds, it takes 4 seconds for the ELSM receive port to cycle through
the states.
After the timer expires, the port checks the number of Hello+ packets against the hold threshold. If
the number of Hello+ packets received is greater than or equal to the configured hold threshold, the
ELSM receive port moves from the Down-Wait state to the Up state.
If the number of Hello(+) packets received is less than the configured hold threshold, the ELSM
receive port moves from the Down-Wait state to the Down state.
The down timer is 4 times the Hello timer.
Up
When an ELSM-enabled port enters the Up state, the Up timer begins. The timer restarts each time
the port receives a Hello+ packet. The Up timer is 6 times the Hello timer.
HelloRx
Specifies the time in which a Hello packet is expected, otherwise the ELSM transmit state changes
from to HelloRx-. The HelloRx timer is 6 times the Hello timer.
Summary of Contents for ExtremeWare 7.5
Page 402: ...402 ExtremeWare 7 5 Command Reference Guide VLAN Commands ...
Page 470: ...470 ExtremeWare 7 5 Command Reference Guide QoS Commands ...
Page 490: ...490 ExtremeWare 7 5 Command Reference Guide NAT Commands ...
Page 826: ...826 ExtremeWare 7 5 Command Reference Guide Commands for Status Monitoring and Statistics ...
Page 1090: ...1090 ExtremeWare 7 5 Command Reference Guide Security Commands ...
Page 1386: ...1386 ExtremeWare 7 5 Command Reference Guide Wireless Commands ...
Page 1436: ...1436 ExtremeWare 7 5 Command Reference Guide EAPS Commands ...
Page 1568: ...1568 ExtremeWare 7 5 Command Reference Guide ESRP Commands ...
Page 1844: ...1844 ExtremeWare 7 5 Command Reference Guide IGP Commands ...
Page 1930: ...1930 ExtremeWare 7 5 Command Reference Guide BGP Commands i Series Switches Only ...
Page 2022: ...2022 ExtremeWare 7 5 Command Reference Guide IP Multicast Commands ...
Page 2066: ...2066 ExtremeWare 7 5 Command Reference Guide IPX Commands i Series Platforms Only ...
Page 2082: ...2082 ExtremeWare 7 5 Command Reference Guide ARM Commands BlackDiamond Switch Only ...
Page 2094: ...2094 ExtremeWare 7 5 Command Reference Guide Remote Connect Commands ...
Page 2174: ...2174 ExtremeWare 7 5 Command Reference Guide PoS Commands BlackDiamond Switch Only ...
Page 2372: ...2372 ExtremeWare 7 5 Command Reference Guide LLDP Commands ...
Page 2422: ...2422 ExtremeWare 7 5 Command Reference Guide H VPLS Commands BlackDiamond Switch Only ...
Page 2528: ...2528 ExtremeWare 7 5 Command Reference Guide MPLS Commands BlackDiamond Switch Only ...
