Specifications

190 ExtremeWare XOS 11.0 Concepts Guide
Ethernet Automatic Protection Switching
Configuring EAPS with STP
To prevent a loop when you run multiple EAPS domains sharing a common link, you must run
Spanning Tree Protocol (STP) on the two common switches using either Extreme Multiple Instance
Spanning Tree Protocol (EMISTP) or IEEE 802.1D port encapsulation mode. This section discusses how
to configure EAPS and STP in either EMISTP or 802.1D encapsulation mode on the switches.
You use EMISTP encapsulation mode when you are running tagged STP Carrier VLAN, and you use
802.1D encapsulation mode when you are running untagged STP Carrier VLAN. All EMISTP traffic
must be tagged; 802.1D traffic cannot be tagged.
Port status Indicates port status as one of the following states:
• Unknown—This EAPS domain is not running, so the port status has
not yet been determined.
• Up—The port is up and is forwarding data.
• Down—The port is down.
• Blocked—The port is up, but data is blocked from being forwarded.
Tag status Tagged status of the control VLAN:
• Tagged—The control VLAN has this port assigned to it, and the port
is tagged in the VLAN.
• Untagged—The control VLAN has this port assigned to it, but the
port is untagged in the control VLAN.
• Undetermined—Either a VLAN has not been added as the control
VLAN to this EAPS domain or this port has not been added to the
control VLAN.
Hello Timer interval The configured value of the timer in seconds, specifying the time that
the master node waits between transmissions of health check packets.
Fail Timer interval The configured value of the timer in seconds, specifying the time that
the master node waits before the failtimer expires.
Failtimer expiry action
1
Displays the action taken when the failtimer expires:
• Send-alert—Sends a critical message to the syslog when the
failtimer expires.
• Open-secondary-port—Opens the secondary port when the failtimer
expires.
Preforwarding Timer interval
2
The configured value of the timer. This value is set internally by the
EAPS software.
Last update
2
Indicates the last time the transit node received a hello packet from the
master node (identified by its MAC address).
EAPS Domain has … Controller Vlans Lists the assigned name and ID of the control VLAN.
EAPS Domain has … Protected Vlans Lists the assigned names and VLAN IDs of all the protected VLANs
configured on this EAPS domain.
Number of Protected Vlans The count of protected VLANs configured on this EAPS domain.
1. This field applies only to master nodes; it does not display for a transit mode.
2. These fields apply only to transit nodes; they are not displayed for a master node.
Table 35: show eaps display fields (continued)
Field Description