extra capacity inherent in a redundant design.
Dynamic Trunking Protocol (DTP) enables dynamic trunk configuration across
all switch ports.
Port Aggregation Protocol (PAgP) automates the creation of Cisco Fast
EtherChannel® groups or Gigabit EtherChannel® groups to link to the upstream
switch/router, or server blades
Link Aggregation Control Protocol (LACP) allows the creation of Ethernet
channeling with upstream switches that conform to IEEE 802.3ad. This feature
is similar to Cisco EtherChannel technology and PAgP.
VLAN Features
Private VLANs restrict traffic between hosts in a common segment by
segregating traffic at Layer 2, turning a broadcast segment into a
nonbroadcast multi-access-like segment.
Private VLAN Edge provides security and isolation between switch ports, which
helps ensure that users cannot snoop on other users’ traffic.
Dynamic VLAN assignment is supported through implementation of VLAN
Membership Policy Server client capability to provide flexibility in assigning
ports to VLANs. Dynamic VLAN facilitates the fast assignment of IP addresses.
Quality of Service
Features
Wire-rate performance for highly granular QoS functions (for example,
granular rate limiting).
Cross-switch QoS allows QoS to be configured across the entire VBS.
802.1p class of service (CoS) and differentiated services code point (DSCP)
field classification is provided, using marking and reclassification on a per-
packet basis by source and destination IP address, MAC address, or Layer 4
TCP/UDP port number.
Cisco control-plane and data-plane QoS ACLs on all ports help ensure proper
marking on a per-packet basis.
Four egress queues per port help enable differentiated management of up to
four traffic types.
Shaped Round Robin (SRR) scheduling helps ensure differential prioritization
of packet flows by intelligently servicing the ingress queues and egress
queues.
Weighted Tail Drop (WTD) provides congestion avoidance at the ingress and
egress queues before a disruption occurs.
Strict priority queuing helps ensure that the highest-priority packets are
serviced ahead of all other traffic.
The Cisco committed information rate (CIR) function provides bandwidth in
increments as low as 8 Kbps.
Rate limiting is provided based on source and destination IP address, source
and destination MAC address, Layer 4 TCP/UDP information, or any
combination of these fields, using QoS ACLs (IP ACLs or MAC ACLs), class maps,
and policy maps.
Up to 64 aggregate or individual policers are available.
QuickSpecs
Cisco Catalyst Blade Switch 3120 for HP
Technical Specifications
DA - 13023 Worldwide — Version 14 — May 2, 2014
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