Span And Rspan - Cisco Catalyst 4500 Series Configuration Manual

Chapter 1 Product Overview

SPAN and RSPAN

Switched Port Analyzer (SPAN) allows you to monitor traffic on any port for analysis by a network
analyzer or Remote Monitoring (RMON) probe. You also can do the following:
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For information on SPAN, see
Remote SPAN (RSPAN) is an extension of SPAN, where source ports and destination ports are
distributed across multiple switches, allowing remote monitoring of multiple switches across the
network. The traffic for each RSPAN session is carried over a user-specified RSPAN VLAN that is
dedicated for that RSPAN session on all participating switches.
For information on RSPAN, see
Universal Power over Ethernet
The IEEE 802.3 Power over Ethernet (PoE) standard sets the maximum power that can be sourced by
data terminal equipment (DTE) at 30W. This power is sourced over two pairs out of the four twisted pairs
of conductors in a Class D, or better, cabling as specified in ISO/IEC 11801:1995.
Cisco® Universal Power over Ethernet (UPOE) is a Cisco proprietary technology that extends the IEEE
802.3 PoE standard to provide the capability to source up to 60W of power over standard Ethernet
cabling infrastructure (Class D or better).
For more information on UPOE, see the "Configuring Universal PoE" section in
"Configuring Power over Ethernet."
Web Content Coordination Protocol
WCCP version 1 is not supported.
Note
Web Content Communication Protocol (WCCP) Version 2 Layer 2 redirection enables Catalyst 4500
series switches to transparently redirect content requests to the directly connected content engines by
using a Layer 2 and MAC address rewrite. The WCCPv2 Layer 2 redirection is accelerated in the
switching hardware, and is more efficient than Layer 3 redirection using Generic Routing Encapsulation
(GRE). The content engines in a cache cluster transparently store frequently accessed content, and then
fulfills successive requests for the same content, eliminating repetitive transmissions of identical content
from the original content servers. It supports the transparent redirection of HTTP and non-HTTP traffic
with ports or dynamic services, such as Web caching, HTTPS caching, File Transfer Protocol (FTP)
caching, proxy caching, media caching, and streaming services. WCCPv2 Layer 2 redirection is
typically deployed for transparent caching at network edge, such as regional or branch sites. WCCPv2
Layer 2 redirection cannot be enabled on the same input interface with PBR or VRF-lite. ACL-based
classification for Layer 2 redirection is not supported.
OL-25340-01
Configure ACLs on SPAN sessions.
Allow incoming traffic on SPAN destination ports to be switched normally.
Explicitly configure the encapsulation type of packets that are spanned out of a destination port.
Restrict ingress sniffing depending on whether the packet is unicast, multicast, or broadcast, and
depending on whether the packet is valid.
Mirror packets sent to or from the CPU out of a SPAN destination port for troubleshooting purposes.
Chapter 55, "Configuring SPAN and RSPAN."
Chapter 55, "Configuring SPAN and RSPAN."
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
Management Features
Chapter 13,
1-29