Cisco Catalyst 4500 Series Software Configuration Guide

45-5
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 45 Configuring AVC with DNS-AS
About AVC with DNS-AS
Figure 45-1 AVC with DNS-AS Process Flow
High Availability and ISSU for AVC with DNS-AS
The AVC with DNS-AS feature supports High Availability and ISSU.
For High Availability, the binding table database of the active DNS-AS client is synchronized with the
standby DNS-AS client. As long as AVC with DNS-AS is enabled, no additional user configuration is
required.
The binding table entries are synchronized when:
• The standby comes up (bulk synchronization).
• New entries are added to the binding table database.
• One or more entries are cleared from the database.
Note AVC with DNS-AS is also supported in the VSS mode, and Quad-Supervisor VSS Mode.
1 Host 3 Authoritative DNS Server
2DNS-AS Client
An “A” record request from
the host to the DNS server
An “A” record response from the
DNS server to the host
A copy of the host’s “A”
record request that the
DNS-AS client saves
——
TXT record and “A” record
request from the DNS-AS
client to the DNS server
TXT record and “A” record
response from the DNS server to
the DNS-AS client
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Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E