Enterasys Security Router X-PeditionTM User Manual page 34

and data-compression negotiation. Also supported: PPPoE client and sub-interface
monitoring, and Multilink PPP protocols as well as Dial on Demand (DoD), Bandwidth on
Demand (BoD), Multi-Class MLPPP.
• IP Protocol - IP supports interconnected systems of packet-switched computer communication
networks. It uses a 32-bit addressing scheme where an IP address is represented by four fields,
each containing 8-bit numbers. Also supported: secondary IP addressing, CIDR, the Virtual
Router Redundancy Protocol (VRRP), Proxy DNS, VLAN and Policy Based routing, Route
Preference, multiple static routes, and AAA, PPP and OSPF debugging.
• DHCP - The XSR supports DHCP Server and Client on the trusted LAN to provide IP
addresses to computers on a customer's private LAN segment, temporary or permanent
network (IP) address and network configuration parameter assignment to clients, persistent
storage/database of network values for network clients - Bindings Database, persistent
storage of network client lease states kept after a system reboot, persistent and user-
controllable conflict avoidance to prevent duplicate IP address including configurable ping
checking, and visibility of DHCP network activity and leases through operator reports
statistics and logs.
• Network Address Translation - static NAT, Network Address Port Translation (NAPT) and
dynamic NAT by source/destination IP address, dynamic NAT pool mapping with overload,
PPTP/GRE ALG and arbitrary IP address for NAPT, on the interface and port-forwarded
static NAT, multiple NATs on an interface.
• IP Routing - The XSR supports RIP, OSPF and BGP4 dynamic routing, a vital function of the IP
protocol. Stored in a routing table, network data is used to determine the route for each packet
passing through the XSR. Also supported: route redistribution between OSPF and RIP, static
routes, multiple static routes to the same destination with different hops and distances,
Virtual Router Redundancy Protocol (VRRP) for default router redundancy and load
balancing, DNS proxy, Virtual Area Networks (VLAN 802.1Q), priority VLAN routing 802.1P,
policy based routing, route preference, multiple static routes, Protocol Independent Multicast
- Sparse Mode (PIM-SM), and configurable RIP and OSPF poll timers.
• Equal-Cost Multi-Path (ECMP) - per packet and per flow (round robin) support for OSPF, BGP
and static routes (RIP excluded).
• Border Gateway Protocol v4 - The XSR supports the following the BGP-4 features: all MIB tables
defined in RFC-1657 including BGP SNMP traps, protection of BGP sessions, capabilities
advertisement, route reflection, communities, route refresh, route flap dampening, AS
confederations, debugging, per neighbor configurable BGP timer and filter tags.
• PIM/IGMP - Protocol Independent Multicast - Sparse Mode (PIM-SM) and Internet Group
Management Protocol (IGMP) is supported with the following features: IGMP versions 1, 2
and 3 (on LAN interface only), PIM-SM version 2, static IGMP group membership, dynamic
RP (BootStrap without Admin Scope Zone support), static RP, register and assert mechanism,
Rendezvous Point Tree (RPT) and Shortest Path Tree (SPT) Build-up, RPT to SPT Switch,
Join/Prune Mechanism, and Source Specific Multicast (SSM).
• Frame Relay - The XSR provides this fast-packet switching method for wide-area networking.
Acting as a DTE, the router encapsulates data in a frame and transmits that data while serving
as a source device. When it is a destination device, it receives frames and de-encapsulates
them. The XSR's implementation of Frame Relay employs DTE support of the User Network
Interface (UNI) for PVC (DLCI) connections with Committed Information Rate (CIR) traffic
shaping, BECN/FECN congestion control, standard LMIs ILMI, ANSI Annex D, CCITT
Annex A, FRF.12 fragmentation, periodic keep-alives, multi-protocol interconnect over Frame
Relay, Frame Relay Inverse ARP, multiple logical interfaces over the same physical port, QoS
including standard FIFO queuing or IP QoS on DLCIs, DCE support, and Frame Relay over
ISDN.
1-2 Overview