Cisco ME 3400 Command Reference Manual page 338
Ethernet access switch
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rep block port
When you select an alternate port by entering an offset number, this number identifies the downstream
neighbor port of an edge port. The primary edge port has an offset number of 1; positive numbers above
1 identify downstream neighbors of the primary edge port. Negative numbers identify the secondary
edge port (offset number -1) and its downstream neighbors. See
SegmentFigure
Figure 2-1
-8
Note
You would never enter an offset value of 1 because that is the offset number of the primary edge port
itself.
If you have configured a preempt delay time by entering the rep preempt delay seconds interface
configuration command and a link failure and recovery occurs, VLAN load balancing begins after the
configured preemption time period elapses without another link failure. The alternate port specified in
the load-balancing configuration blocks the configured VLANs and unblocks all other segment ports. If
the primary edge port cannot determine the alternate port for VLAN balancing, the default action is no
preemption.
Each port in a segment has a unique port ID. The port ID format is similar to the one used by the spanning
tree algorithm: a port number (unique on the bridge) associated to a MAC address (unique in the
network). To determine the port ID of a port, enter the show interface interface-id rep detail privileged
EXEC command.
Examples
This example shows how to configure REP VLAN load balancing on the Switch B primary edge port
(Gigabit Ethernet port 0/1) and to configure Gigabit Ethernet port 0/2 of Switch A as the alternate port
to block VLANs 1 to 100. The alternate port is identified by its port ID, shown in bold in the output of
the show interface rep detail command for the Switch A port.
Switch A# show interface gigabitethernet0/2 rep detail
GigabitEthernet0/2 REP enabled
Segment-id: 2 (Segment)
PortID: 0080001647FB1780
Preferred flag: No
Operational Link Status: TWO_WAY
Current Key: 007F001647FB17800EEE
Port Role: Open
Blocked Vlan: <empty>
Admin-vlan: 1
Preempt Delay Timer: 35 sec
Load-balancing block port: none
Cisco ME 3400 Ethernet Access Switch Command Reference
2-312
2-1.
Neighbor Offset Numbers in a REP Segment
-1
E1
E2
1
10
-9
2
3
4
-7
5
6
-5
-6
Chapter 2
Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
E1 = Primary edge port
E2 = Secondary edge port
-2
Offset numbers from the primary edge port
9
Offset numbers from the secondary edge
port (negative numbers)
-3
8
7
-4
Neighbor Offset Numbers in a REP
OL-9640-07
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