Specifications
4-16
Cisco MWR 2941 Mobile Wireless Edge Router Software Configuration Guide, Release 12.2(33)MRB
OL-21227-02
Chapter 4 Configuring the Cisco MWR 2941 Router Using the CLI
Configuration Sequence
• If you connect an STP network to the REP segment, be sure that the connection is at the segment
edge. An STP connection that is not at the edge could cause a bridging loop because STP does not
run on REP segments. All STP BPDUs are dropped at REP interfaces.
• You must configure all trunk ports in the segment with the same set of allowed VLANs, or a
misconfiguration occurs.
• REP ports follow these rules:
–
There is no limit to the number of REP ports on a switch; however, only two ports on a switch
can belong to the same REP segment.
–
If only one port on a switch is configured in a segment, the port should be an edge port.
–
If two ports on a switch belong to the same segment, they must be both edge ports, both regular
segment ports, or one regular port and one edge no-neighbor port. An edge port and regular
segment port on a switch cannot belong to the same segment.
Note Release 12.2(33)MRA does not support the no-neighbor keyword.
–
If two ports on a switch belong to the same segment and one is configured as an edge port and
one as a regular segment port (a misconfiguration), the edge port is treated as a regular segment
port.
• REP interfaces come up and remain in a blocked state until notified that it is safe to unblock. You
need to be aware of this to avoid sudden connection losses.
• REP sends all LSL PDUs in untagged frames on the native VLAN. The BPA message sent to the
Cisco multicast address is sent on the administration VLAN, which is VLAN 1 by default.
• REP ports cannot be configured as one of these port types:
–
SPAN destination port
–
Private VLAN port
–
Tunnel port
–
Access port
• REP is supported on EtherChannels, but not on an individual port that belongs to an EtherChannel.
• There is a maximum of 64 REP segments per switch.
Configuring the REP Administrative VLAN
To avoid the delay introduced by relaying messages in software for link-failure or VLAN-blocking
notification during load balancing, REP floods packets at the hardware flood layer (HFL) to a regular
multicast address. These messages are flooded to the whole network, not just the REP segment. You can
control flooding of these messages by configuring an administrative VLAN for the whole domain.
Follow these guidelines when configuring the REP administrative VLAN:
• If you do not configure an administrative VLAN, the default is VLAN 1.
• There can be only one administrative VLAN on a switch and on a segment. However, this is not
enforced by software.
• The administrative VLAN cannot be the RSPAN VLAN.