Data Sheet
© 2008-2009 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 9 of 21
Availability and Scalability
Superior redundancy for
fault backup
●
IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) provides rapid spanning-tree
convergence independent of spanning-tree timers and offers the benefit of distributed
processing.
●
Per-VLAN Rapid Spanning Tree (PVRST+) allows rapid spanning-tree reconvergence on a
per-VLAN spanning-tree basis, without requiring the implementation of spanning-tree
instances.
●
Cisco Hot Standby Router Protocol (HSRP and HSRPv2) is supported to create redundant,
fail-safe routing topologies.
●
Unidirectional Link Detection Protocol (UDLD) and Aggressive UDLD allow unidirectional links
caused by incorrect fiber-optic connections or port faults to be detected and disabled on fiber-
optic interfaces.
●
Flex-Link provides fast failover of ports without overhead of control protocols such as the
Spanning Tree Protocol.
●
Switch-port autorecovery (errdisable) automatically attempts to reactivate a link that is
disabled because of a network error.
●
Equal-cost routing provides for load balancing and redundancy.
●
Bandwidth aggregation up to 800 Mbps through Cisco Fast EtherChannel
®
technology
enhances fault tolerance and offers greater aggregated bandwidth between switches and to
routers and individual servers.
●
Link-State Tracking helps accelerate Layer 3 reconvergence by taking UNI down when the
associated NNI is down.
●
Resilient Ethernet Protocol (REP) provides fast Layer 2 reconvergence in a ring network and
offers an alternative to Spanning Tree Protocol.
High-performance
IP routing
●
Cisco Express Forwarding hardware routing architecture delivers extremely high-performance
IP routing.
●
Basic IP Unicast routing protocols (static and RIP versions 1 and 2) are supported for small-
network routing applications.
●
Advanced IP Unicast routing protocols (OSPF, EIGRP, IS-IS, and BGPv4) are supported for
load balancing and constructing scalable LANs.
●
HSRP provides dynamic load balancing and failover for routed links; up to 32 HSRP links are
supported per unit.
●
Inter-VLAN IP routing provides for full Layer 3 routing between two or more VLANs.
●
BFD allows rapid detection of path and system failures by using a fast hello mechanism. BFD
can provide failure detection on any kind of path between systems. Routing protocols
supported include OSPF, IS-IS, BGP, HSRP and EIGRP.
●
Protocol Independent Multicast (PIM) for IP Multicast routing is supported, including PIM
sparse mode (PIM-SM), PIM dense mode (PIM-DM), and PIM sparse-dense mode. The Metro
IP Access image is required.
●
IPv6 improves the scalability of IP networks by supporting the growing number of users,
applications and services. The functionalities supported include ACLs, DHCP, routing
(Unicast routing, RIP, OSPFv3, static routes), MLD snooping, stateless autoconfig, default
router preference, HTTP/HTTPS.
●
Cisco recommends 128 switch virtual interfaces (SVIs). A maximum of 1000 are supported
(depending on the number of routes and multicast entries).
Multicast
Efficient multicast
distribution
●
Multicast VLAN Registration provides efficient multicast distribution in ring networks by
dedicating a single VLAN for multicast traffic, thereby removing duplicate multicast traffic in
other VLANs.
●
PIM-SM provides efficient routing of multicast traffic by establishing distribution trees across
WANs.
●
Source Specific Multicast (SSM) reduces the need for IP Multicast address management and
prevents DoS attacks against receivers.
●
SSM mapping provides a mapping of source to group, which allows listeners to find/connect
to multicast sources dynamically, reducing dependencies on the application.
●
Multicast Listener Discovery (MLD) snooping v1 and v2 enables efficient distribution of IPv6
multicast data. With MLD snooping, IPv6 multicast data is selectively forwarded to a list of
ports that want to receive the data, instead of being flooded to all ports in a VLAN.
Robust multicast control
●
IGMP Snooping helps enable intelligent management of multicast traffic by examining IGMP
messages.
●
IGMP Fast Leave provides a fast channel-changing capability for IPTV services.
●
IGMP filtering provides control of groups each user can access.
●
IGMP Throttling controls the maximum number of multicast groups each user can access.
●
IGMP Proxy allows users anywhere on a downstream network to join an upstream sourced
multicast group.
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