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Cisco Catalyst Switch Module 3110 and 3012 for IBM BladeCenter Software Configuration Guide
OL-12189-01
Chapter 1 Overview
Features
• SNMP can be configured over IPv6 transport so that an IPv6 host can send SNMP queries and
receive SNMP notifications from a device running IPv6.
• IPv6 supports stateless autoconfiguration to manage link, subnet, and site addressing changes, such
as management of host and mobile IP addresses.
Note For additional descriptions of the management interfaces, see the “Network Configuration Examples”
section on page 1-16.
Availability and Redundancy Features
These are the availability and redundancy features:
• HSRP for command switch and Layer 3 router redundancy
• Automatic stack master re-election (failover support) for replacing stack masters that become
unavailable (only the Catalyst Switch Module 3110)
The newly elected stack master begins accepting Layer 2 traffic in less than 1 second and Layer 3
traffic between 3 to 5 seconds.
• Cross-stack EtherChannel for providing redundant links across the switch stack (only the Catalyst
Switch Module 3110)
• UniDirectional Link Detection (UDLD) and aggressive UDLD for detecting and disabling
unidirectional links on fiber-optic interfaces caused by incorrect fiber-optic wiring or port faults
• IEEE 802.1D Spanning Tree Protocol (STP) for redundant backbone connections and loop-free
networks. STP has these features:
–
Up to 128 spanning-tree instances supported
–
Per-VLAN spanning-tree plus (PVST+) for load-balancing across VLANs
–
Rapid PVST+ for load-balancing across VLANs and providing rapid convergence of
spanning-tree instances
–
UplinkFast, cross-stack UplinkFast (only the Catalyst Switch Module 3110), and BackboneFast
for fast convergence after a spanning-tree topology change and for achieving load-balancing
between redundant uplinks, including Gigabit uplinks and cross-stack Gigabit uplinks (only the
Catalyst Switch Module 3110)
• IEEE 802.1s Multiple Spanning Tree Protocol (MSTP) for grouping VLANs into a spanning-tree
instance and for providing multiple forwarding paths for data traffic and load-balancing and rapid
per-VLAN Spanning-Tree plus (rapid-PVST+) based on the IEEE 802.1w Rapid Spanning Tree
Protocol (RSTP) for rapid convergence of the spanning tree by immediately changing root and
designated ports to the forwarding state
• Optional spanning-tree features available in PVST+, rapid-PVST+, and MSTP mode:
–
Port Fast for eliminating the forwarding delay by enabling a port to immediately change from
the blocking state to the forwarding state
–
BPDU guard for shutting down Port Fast-enabled ports that receive bridge protocol data units
(BPDUs)
–
BPDU filtering for preventing a Port Fast-enabled port from sending or receiving BPDUs
