Esrp Modes Of Operation - Extreme Networks ExtremeWare XOS Command Reference Manual

ESRP Commands

ESRP Modes of Operation

ExtremeWare XOS has two modes of ESRP operation: standard and extended. Select standard if your
network contains some switches running ExtremeWare, others running ExtremeWare XOS, and a
combination of those switches participating in ESRP. Standard ESRP is backward compatible with and
supports the ESRP functionality of ExtremeWare.
Select extended ESRP if your network contains switches running only ExtremeWare XOS. Extended
mode ESRP supports and is compatible with switches running ExtremeWare XOS. By default,
ExtremeWare XOS operates in extended mode.
ESRP-Aware Switches
Extreme Networks switches that are not actively participating in ESRP but are connected on a network
that has other Extreme Networks switches running ESRP are ESRP-aware. When ESRP-aware switches
are attached to ESRP-enabled switches, the ESRP-aware switches reliably perform failover and failback
scenarios in the prescribed recovery times. For an Extreme Networks switch to be ESRP-aware, you
must create an ESRP domain on the aware switch (however, you do not enable the ESRP domain), add
a master VLAN to that ESRP domain, and configure a domain ID, if necessary.
To participate as an ESRP-aware switch, the following must be true:
The ESRP domain name must identical on all switches (ESRP-enabled and ESRP-aware) participating
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in ESRP for that particular domain.
The master VLAN name and IP address must be identical on all switches (ESRP-enabled and ESRP-
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aware) participating in ESRP for that particular domain.
The domain ID must be identical on all switches (ESRP-enabled or ESRP-aware) participating in
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ESRP for that particular domain.
If you have an untagged master VLAN, you must specify an ESRP domain ID.
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If you have a tagged master VLAN, ESRP uses the 802.1Q tag (VLANid) of the master VLAN for
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the ESRP domain ID. If you do not use the VLANid as the domain ID, you must specify a
different domain ID.
Extreme Loop Recovery Protocol
ExtremeWare XOS 11.1 introduces support for the Extreme Loop Recovery Protocol (ELRP). ELRP is a
feature of ExtremeWare XOS that allows you to prevent, detect, and recover from Layer 2 loops in the
network. You can use ELRP with other protocols such as ESRP.
With ELRP, each switch, except for the sender, treats the ELRP PDU as a Layer 2 multicast packet. The
sender uses the source and destination MAC addresses to identify the packet it sends and receives.
When the sender receives its original packet back, that triggers loop detection and prevention. Once a
loop is detected, the loop recovery agent is notified of the event and takes the necessary actions to
recover from the loop. ELRP operates only on the sending switch; therefore, ELRP operates
transparently across the network.
Details of using the standalone ELRP client are discussed in the ExtremeWare XOS User Guide chapter,
"Troubleshooting," and the commands used to configure standalone ELRP are described in
"Troubleshooting
982
Commands."
Appendix
ExtremeWare XOS 11.3 Command Reference
B,