Extreme Networks ExtremeWare XOS 11.3, Руководство пользователя

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Extreme Standby Router Protocol
ExtremeWare XOS 11.3 Concepts Guide
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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.
If Extreme Networks switches running ESRP are connected to Layer 2 switches that are manufactured
by third-party vendors, the failover times for traffic local to that segment may appear longer, depending
on the application involved and the FDB timer used by the other vendor’s Layer 2 switch. ESRP can be
used with Layer 2 switches from other vendors, but the recovery times vary.
The VLANs associated with the ports connecting an ESRP-aware switch to an ESRP-enabled switch
must be configured using an 802.1Q tag on the connecting port; or, if only a single VLAN is involved, as
untagged using the protocol filter
any
. ESRP will not function correctly if the ESRP-aware switch
interconnection port is configured for a protocol-sensitive VLAN using untagged traffic. You can also
use port restart in this scenario. For more information about port restart, see
“ESRP Port Restart” on
page 473 .
Configuring ESRP-Aware Switches
For an Extreme Networks switch to be ESRP-aware, you must create an ESRP domain on the aware
switch, 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
in ESRP for that particular domain.
●
The master VLAN name and IP address must be identical on all switches (ESRP-enabled and ESRP-
aware) participating in ESRP for that particular domain.
●
The domain ID must be identical on all switches (ESRP-enabled or ESRP-aware) participating in
ESRP for that particular domain.
■
If you have an untagged master VLAN, you must specify an ESRP domain ID.
■
If you have a tagged master VLAN, ESRP uses the 802.1Q tag (VLANid) of the master VLAN for
the ESRP domain ID. If you do not use the VLANid as the domain ID, you must specify a
different domain ID.
NOTE
Before you begin, make a note of the ESRP domain parameters on the ESRP-enabled switch. That way you can
easily refer to your notes while creating the ESRP domain on the ESRP-aware switch.
To configure an ESRP-aware switch, complete the following steps:
1 Create an ESRP domain using the
create esrp <esrpDomain>
command.
After you create the domain, do not enable it.
2 Add a master VLAN to your ESRP domain using the
configure esrp <esrpDomain> add master
<vlan_name>
command.
You are only required to add a master VLAN to the ESRP domain. You are not required to add
member VLANs to the ESRP domain.
3 If necessary, configure a domain ID for the ESRP domain using the
configure esrp <esrpDomain>
domain-id <number>
command.