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Document No. 650-100-700, Issue 1 6-13
Using VLANs, Hunt Groups, and VTP Snooping
Hunt Groups expand the capacity of the core switched backbone. While
there is no specific limit on the number of ports in a Hunt Group (see “
Hunt
Group Configuration Considerations ”). In the example, the Hunt Group
consists of two full-duplex Gigabit Ethernet links shared between two
switches, for an aggregate capacity of 4 Gbps. Enterprise-level servers can
be directly attached to the switching core using either 100 Mbps or Gigabit
Ethernet connections. Fault-tolerant spanning tree links from the core to the
next level of network spread the distribution and capacity to building or
departmental switching centers. Each of these next-level switches may in
turn support tens (or even hundreds) of workgroup switches and users.
Features
Hunt group features include:
■
Shared traffic load.
■
Fault tolerance — If a port in a group fails, the remaining ports in
the group pick up the traffic load.
■
Support for any number of same-speed same media type
connections in a group — The group is not restricted to a single
module in a switch.
■
Quicker recovery from link failure — If a port in the group fails, the
remaining ports carry the load. Recovery is not limited by Spanning
Tree Protocol convergence time (convergence time is the time the
network takes to resume steady-state forwarding after Spanning
Tree Protocol reconfiguration).
■
Supports up to 25 hunt groups per switch, if 48-port mode is
disabled and up to 13 hunt groups if 48-port mode is enabled.
Hunt Group Terminology
Base Port/Flood port- When the hunt group is configured, there is one port
designated “Base Port”. All ports in the hunt group assume the identity of
the base port. The base port passes all flood frames, broadcast frames,
destination unknown unicast, and multicast frames for VLANs associated
with the hunt group. Spanning Tree treats all ports in the hunt group as one
port. The base port sends and receives Bridge Protocol Data Units
(BPDU’s).
Member port - A port that is a member of the hunt group. Sometimes
referred to as a “Participating port”.
Non-member port - A port that is not a member of a hunt group.
sometimes referred to as a “non-Participating port”.