Carrier Access 3750 Series Implementation of spanning-tree instances, Failsafe routing topologies

Table 1 Product Features and Benefits

Feature	Benefit
	• 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) is supported to create redundant,
	failsafe routing topologies.
	• Command-switch redundancy enabled in Cisco CMS Software allows designation
	of a backup command switch that takes over cluster management functions if the
	primary command switch fails.
	• UniDirectional Link Detection (UDLD) and Aggressive UDLD allow unidirectional
	links caused by incorrect fiber-optic wiring or port faults to be detected and
	disabled on fiber-optic interfaces.
	• Switch port auto-recovery (errdisable) automatically attempts to re-enable a link
	that is disabled due to a network error.
	• Cisco Redundant Power System 675 (RPS 675) support provides superior
	power-source redundancy for up to 6 Cisco networking devices, resulting in
	improved fault tolerance and network uptime.
	• Equal-cost routing for load balancing and redundancy.
	• Bandwidth aggregation up to 8 Gbps through Gigabit EtherChannel technology
	and up to 800 Mbps through Fast EtherChannel technology enhances fault
	tolerance and offers higher-speed aggregated bandwidth between switches and
	to routers and individual servers.
High-performance IP routing	• Cisco Express Forwarding hardware routing architecture delivers extremely
	high-performance IP routing.
	• Basic IP unicast routing protocols (static, Routing Information Protocol Version 1
	[RIPv1], and RIPv2) are supported for small-network routing applications.
	• IPv6 routing support in hardware for maximum performance in the future.
	• Advanced IP unicast routing protocols (Open Shortest Path First [OSPF], Interior
	Gateway Routing Protocol [IGRP], Enhanced IGRP [EIGRP], and Border Gateway
	Protocol Version 4 [BGPv4]) are supported for load balancing and constructing
	scalable LANs. Enhanced Multilayer Software Image (EMI) is required.
	• Policy-based routing (PBR) allows superior control by enabling flow redirection
	regardless of the routing protocol configured. EMI is required.
	• Inter-VLAN IP routing for full Layer 3 routing between 2 or more VLANs.
	• 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. EMI is required.
	• Distance Vector Multicast Routing Protocol (DVMRP) tunneling interconnects 2
	multicast-enabled networks across non-multicast networks. EMI is required.
	• Fallback bridging forwards non-IP traffic between 2 or more VLANs. EMI is
	required.
	• Routing is enabled across the stack.
	• 1000 switch virtual interfaces (SVIs) (depends on the number of routes and
	multicast entries) and 468 routed ports are supported per stack.

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