Cisco Cisco IOS Software Release 12.0(19)S
IP Services Engine Line Cards
Feature Overview
10
Cisco IOS Release 12.0(19)S
Point-to-Point Protocol (PPP)
PPP provides a method for transmitting datagrams over serial point-to-point links. The ISE line cards
support the following:
support the following:
•
PPP encapsulation/termination per link
•
PPP over SONET/SDH
See the Cisco Systems publication Point-to-Point Protocol for additional information. This document is
part of the Internetworking Technology Overview.
part of the Internetworking Technology Overview.
Frame Relay
See
for additional information on feature capability and configuration.
The ISE line cards support the following Frame Relay features:
•
UNI (User-Network Interface) termination.
•
Cisco, American National Standards Institute (ANSI) and International Telecommunications Union
(ITU) Local Management Interface (LMI) with auto sensing.
(ITU) Local Management Interface (LMI) with auto sensing.
•
Enhanced Local Management Interface (ELMI) address registration: this feature enables a network
management system (NMS) to detect connectivity among the switches and routers in a network
using the Enhanced Local Management Interface (ELMI) protocol. During ELMI version
negotiation, neighboring devices exchange their management IP addresses and index. The NMS
polls the devices to collect this connectivity information.
management system (NMS) to detect connectivity among the switches and routers in a network
using the Enhanced Local Management Interface (ELMI) protocol. During ELMI version
negotiation, neighboring devices exchange their management IP addresses and index. The NMS
polls the devices to collect this connectivity information.
•
Inverse ARP. Inverse ARP is available for IP only in the ISE line cards. Frame Relay Inverse ARP
is a method of building dynamic address mappings in Frame Relay networks. Inverse ARP allows
the router or access server to discover the protocol address of a device associated with the virtual
circuit.
is a method of building dynamic address mappings in Frame Relay networks. Inverse ARP allows
the router or access server to discover the protocol address of a device associated with the virtual
circuit.
•
Cisco Discovery Protocol (CDP) over Frame Relay. With CDP, network management applications
can learn the device type and the SNMP agent address of neighboring devices. This enables
applications to send SNMP queries to neighboring devices. CDP runs over the data link layer only.
Therefore, two systems that support different network-layer protocols can learn about each other.
can learn the device type and the SNMP agent address of neighboring devices. This enables
applications to send SNMP queries to neighboring devices. CDP runs over the data link layer only.
Therefore, two systems that support different network-layer protocols can learn about each other.
Internet Protocol Version 4 (IPv4) Unicast Forwarding
ISE line cards support the following IPv4 features.
See
for additional information on feature capability and configuration.
•
Distributed cisco express forwarding (dCEF) support
Cisco express forwarding (CEF) is advanced Layer 3 IP switching technology. CEF optimizes
network performance and scalability for networks with large and dynamic traffic patterns, such as
the Internet, on networks characterized by intensive web-based applications, or interactive sessions.
When distributed CEF (dCEF) is enabled, the ISE line cards maintain an identical copy of the
Forwarding Information Base (FIB) and adjacency tables. The line cards perform the express
forwarding between port adapters, relieving the route processor of involvement in the switching
operation.
Cisco express forwarding (CEF) is advanced Layer 3 IP switching technology. CEF optimizes
network performance and scalability for networks with large and dynamic traffic patterns, such as
the Internet, on networks characterized by intensive web-based applications, or interactive sessions.
When distributed CEF (dCEF) is enabled, the ISE line cards maintain an identical copy of the
Forwarding Information Base (FIB) and adjacency tables. The line cards perform the express
forwarding between port adapters, relieving the route processor of involvement in the switching
operation.
•
Layer 3 load balancing using CEF.
•
The maximum transmission unit (MTU) is configurable to 9188 bytes (jumbo frame). MTU defines
the largest size of packets that an interface can transmit without needing to fragment. IP packets
larger than the MTU must go through IP fragmentation procedures.
the largest size of packets that an interface can transmit without needing to fragment. IP packets
larger than the MTU must go through IP fragmentation procedures.