High Availability Features For J-Ex Series Switches Overview - Dell PowerConnect J-EX4200-24T Software Manual

Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS
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High Availability Features for J-EX Series Switches Overview

VRRP
18
Firewall Filters—Allow auditing of various types of security violations, including attempts
to access the switch from unauthorized locations. Firewall filters can detect such attempts
and create audit log entries when they occur. The filters can also restrict access by limiting
traffic to source and destination MAC addresses, specific protocols, or, in combination
with policers, to specified data rates to prevent denial of service (DoS) attacks.
Policers—Provide rate-limiting capability to control the amount of traffic that enters an
interface, which acts to counter DoS attacks.
Encryption Standards—Supported standards include:
128-, 192-, and 256-bit Advanced Encryption Standard (AES)
56-bit Data Encryption Standard (DES) and 168-bit 3DES
802.1X for J-EX Series Switches Overview on page 2253
Firewall Filters for J-EX Series Switches Overview on page 2721
Port Security for J-EX Series Switches Overview on page 2545
Understanding Proxy ARP on J-EX Series Switches on page 1059
Understanding Storm Control on J-EX Series Switches on page 2511
Understanding the Use of Policers in Firewall Filters on page 2752
High availability refers to the hardware and software components that provide redundancy
and reliability for packet-based communications. This topic covers the following high
availability features of J-EX Series Switches:
VRRP on page 18
Graceful Protocol Restart on page 19
Redundant Routing Engines on page 19
Graceful Routing Engine Switchover on page 20
Virtual Chassis Software Upgrade and Failover Features on page 20
Link Aggregation on page 20
You can configure the Virtual Router Redundancy Protocol (VRRP) or VRRP for IPv6 on
Gigabit Ethernet interfaces, 10-Gigabit Ethernet interfaces, and logical interfaces on J-EX
Series switches. When VRRP is configured, the switches act as virtual routing platforms.
VRRP enables hosts on a LAN to make use of redundant routing platforms on that LAN
without requiring more than the static configuration of a single default route on the hosts.
The VRRP routing platforms share the IP address corresponding to the default route
configured on the hosts. At any time, one of the VRRP routing platforms is the master
(active) and the others are backups. If the master routing platform fails, one of the backup
routing platforms becomes the new master, providing a virtual default routing platform