Cisco IOS Software for Cisco Catalyst 4900 Series Switches S49ESK9-12231SGA= ユーザーズマニュアル
製品コード
S49ESK9-12231SGA=
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Product Bulletin No. 364873
Cisco IOS Software Release 12.2(31)SGA for
Cisco Catalyst 4900 Series Switches
Cisco Catalyst 4900 Series Switches
This product bulletin describes the hardware and software features supported by Cisco IOS
®
Software
Release 12.2(31)SGA for the Cisco
®
Catalyst
®
4900 and Cisco ME-4900 Series Switches.
KEY RELEASE MESSAGE
A new Cisco 4900 fixed configuration platform—Cisco ME-4924-10GE is introduced in this release for Broadband Aggregation. The
ME-4924-10GE has 28 Gigabit Ethernet (Small Form-Factor Pluggable [SFP]) and two 10 Gigabit Ethernet (X2) wire-rate ports. This new
switch is 1 RU and features 1+1 redundant internal AC or DC power supplies and a hot swappable fan tray. It will run the same images as
the Catalyst 4900 Series Switch; see Table 2 for details.
NEW SOFTWARE FEATURES
Trunk Port Security over EtherChannel
Trunk port security over EtherChannel
®
is an extension of trunk port security where redundant links from a single station are connected
to a Catalyst 4500/4900 using EtherChannel. The feature enables customers to block access to the Catalyst 4500/4900 by MAC addresses
other than the ones specified (or learned) on EtherChannel trunk interfaces. It preserves all the advantages of port security and
EtherChannel, including redundancy and load sharing. This feature is typically deployed in data center environments with dual network
interface card (NIC) servers connecting to a Catalyst 4500/4900 using EtherChannel.
Match CoS for Non-IPv4 Traffic
The match class of service (CoS) feature helps a service provider to classify packets based on CoS values while preserving its customers’
packet differentiated services code point (DSCP) values inside the service provider network. The match Cos for non-IPv4 feature provides
uniform class-level quality-of-service (QoS) semantics irrespective of traffic type on a dot1q-tunnel and regular trunk ports. This is
typically deployed in a Q-in-Q environment, where double-tagged IPv4 packets are forwarded as non-IPV4 packets.
L2PT over Trunk
Layer 2 Protocol Tunneling (L2PT) allows customer switches to participate in L2 protocols across a service provider network. This is
achieved by encapsulating Layer 2 protocol packets, such as Cisco Discovery Protocol (CDP), Spanning Tree Protocol (STP), or VLAN
Trunking Protocol (VTP), before sending them across the service provider network. As a result, the customer premises equipment (CPE)
switches on either side of the service provider network can continue to process the L2 protocol control packets as if they were being
received from a directly connected neighboring switch. The existing implementation allowed L2PT to be used only on tunnel ports.
This feature will extend the functionality so that L2PT will be available on trunk ports configured with dot1q encapsulation.
CoS Mutation
The CoS mutation feature enables Service Providers to provide differentiated services for video, voice, and data within the service provider
network. In a typical L2 VPN offered by service providers, double tagged Q-in-Q traffic is forwarded with the outer tag representing the
service provider’s VLAN and the inner tag representing the customer’s VLAN. Service providers could either retain the CoS values from
the customer tag in the service provider tag or change the CoS value of the outer service provider tag based on inner customer QoS
matching and classification. As a result, differentiated levels of service can be provided within the service provider network.