Specifications

Release Notes for Cisco IOS Release 12.0 S

78-7130-11 Rev. B0

New and Changed Information

relevant bits of which are ported into this development. The double switching is performed by handling

the received IP packet in the existing code path until it is determined that the packet needs encapsulation

or de-encapsulation, at which point the necessary actions are performed, and the resultant IP packet is

recursively forwarded through the IP switching path again. See the following document for further

information:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s11/12

s_dgre.htm

Enhanced Gigabit Ethernet Interface Processor

Platforms: Cisco 7500/RSP series

The Enhanced Gigabit Ethernet Interface Processor (GEIP+) is a single-port interface processor that,

when combined with the appropriate optical fiber cable and a Gigabit Interface Converter (GBIC),

provides one Gigabit Ethernet (GE) interface that is compliant with the IEEE 802.3z specification. The

GE interface on a GEIP+ operates in full-duplex mode. See the following document for further

information:

http://www.cisco.com/univercd/cc/td/doc/product/core/cis7505/vip1/vip4/10699dwg/index.htm

Frame Relay Switching on Engine 2

Platforms: Cisco 12000 series

Cisco IOS Release 12.0(11)S supports Frame Relay switching on Engine 2 for the Cisco 12000 series

gigabit switch router (GSR). Frame Relay is an industry-standard, switched data link layer protocol that

handles multiple virtual circuits using High-Level Data Link Control (HDLC) encapsulation between

connected devices.

ifIndex Persistence

Platforms: Cisco 7200 series, Cisco 750/RSP series, Cisco 12000 series

One of the most commonly used identifiers used in SNMP-based network management applications is

the Interface Index (ifIndex) value. IfIndex is a unique identifying number associated with a physical

or logical interface; as far as most software is concerned, the ifIndex is the “name” of the interface.

Although there is no requirement in the relevant RFCs that the correspondence between particular

ifIndex values and their interfaces be maintained across reboots, applications such as device inventory,

billing, and fault detection increasingly depend on the maintenance of this correspondence.

Cisco IOS Release 12.0(11)S adds support for an ifIndex value that can persist across reboots, allowing

users to avoid the workarounds previously required for consistent interface identification. The Interface

Index Persistence feature allows for greater accuracy when collecting and processing network

management data by uniquely identifying input and output interfaces for traffic flows and SNMP

statistics. Relating each interface to a known entity (such as an ISP customer)allows network

management data to be more effectively utilized. See the following document for further information:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s11/12

sifidx.htm