User guide

September 2009
Page 28 of 79 OmniSwitch 6400/6850/6855/9000/9000E—Release 6.4.2.R01
BFD is supported with the following Layer 3 protocols: BGP, OSPF, VRRP Tracking and Static
Routes.
When BFD is configured and enabled, BFD sessions are created and timers are negotiated between
BFD neighbors. If a system does not receive a BFD control packet within the negotiated time interval,
the neighbor system is considered down. Rapid failure detection notices are then sent to the routing
protocol, which initiates a routing protocol recalculation. This process can reduce the time of
convergence in a network.
BGP4
The Border Gateway Protocol (BGP) is an exterior routing protocol that guarantees the loop-free
exchange of routing information between autonomous systems. The Alcatel-Lucent implementation
supports BGP version 4 as defined in RFCs 1771/4271, 2439, 3392, 2385, 1997, 4456, 3065, 4273 and
4486.
The Alcatel-Lucent implementation of BGP is designed for enterprise networks, specifically for border
routers handling a public network connection, such as the organization’s Internet Service Provider
(ISP) link. Up to 65,000 route table entries and next hop routes can be supported by BGP.
BGP IPv6 Extensions
The Omniswitch provides IPv6 support for BGP using Multiprotocol Extensions. The same procedures
used for IPv4 prefixes can be applied for IPv6 prefixes as well and the exchange of IPv4 prefixes will
not be affected by this new feature. However, there are some attributes that are specific to IPv4, such as
AGGREGATOR, NEXT_HOP and NLRI. Multiprotocol Extensions for BGP also supports backward
compatibility for the routers that do not support this feature. This implementation supports
Multiprotocol BGP as defined in the following RFCs 4760 and 2545.
Note that IPv6 extensions for BGP are only supported on the OmniSwitch 6850 and 9000.
The feature includes Webview and SNMP support.
BGP Graceful Restart
BGP Graceful Restart is now supported and is enabled by default. On OmniSwitch devices in a
redundant CMM configuration, during a CMM takeover/failover, interdomain routing is disrupted.
Alcatel-Lucent Operating System BGP needs to retain forwarding information and also help a peering
router performing a BGP restart to support continuous forwarding for inter-domain traffic flows by
following the BGP graceful restart mechanism. This implementation supports BGP Graceful Restart
mechanisms as defined in the RFC 4724.
Command Line Interface (CLI)
Alcatel-Lucent’s command line interface (CLI) is a text-based configuration interface that allows you
to configure switch applications and to view switch statistics. Each CLI command applicable to the
switch is defined in the CLI Reference guide. All command descriptions listed in the Reference Guide
include command syntax definitions, defaults, usage guidelines, example screen output, and release
history.
The CLI uses single-line text commands that are similar to other industry standard switch interfaces.
Detect ARP Poisoning
This feature detects the presence of an ARP-Poisoning host on the network using configured restricted
IP addresses for which the switch, on sending an ARP request, should not get back an ARP response. If
an ARP response is received, the event is logged and the user is alerted using an SNMP trap.
By default ARP requests are not added to the ARP cache. Only router solicited ARP requests will be
added to the cache.