316
C
HAPTER
13: V
IRTUAL
R
OUTER
R
EDUNDANCY
(VRRP)
■
When you define a primary virtual router, selecting
auto-learn
as
the address mode automatically adds all IP addresses that are
associated with the selected VLAN to the primary virtual router.
■
When you define a primary router on a VLAN that contains a single
interface, the single interface is automatically chosen as the
primary address when you select
IP-address
as the address
mode.
■
When you define a backup virtual router, selecting
auto-learn
as
the address mode configures the backup router to learn the IP
addresses that are associated with the virtual router by means of
VRRP advertisements from the primary router. The primary router
must be up for backup routers to learn the addresses that are
associated with the specified VRID.
■
When you define backup virtual routers, the
auto-learn
option
enables automatic address learning for the specified VRID. If a new
interface is added to the VLAN on a primary virtual router, the new
IP address is sent out in VRRP advertisements so that the backup
routers in
auto-learn
mode can learn the new address, saving you
from having to manually add the new address to each backup
router.
■
Regarding advertisement intervals, consider the following:
■
The smaller the advertisement interval, the smaller the failover time
if the master fails.
■
The advertisement interval must be the same across the set of
VRRP routers that are associated with a single VRID. Backup routers
must have the same advertisement interval as the master router.
Options
Prompt
Description
Possible Values
[Default]
VLAN
interface
index
Index number of the
virtual LAN (VLAN) on
which you want to
define the virtual
router
■
Index number of an IP
virtual LAN (VLAN) that is
defined on the module.
■
? (for a list of selectable
indexes)
Index
number of
first available
VLAN
VRID
Virtual router
identifier. Identifies
the virtual router that
you want to define on
the LAN.
1 – 255
1
Summary of Contents for 4007
Page 1: ...http www 3com com Switch 4007 Command Reference Guide Part No 10013693 Published May 2000...
Page 14: ......
Page 22: ...22 ABOUT THIS GUIDE...
Page 34: ...34 CHAPTER 1 ADMINISTRATION OVERVIEW...
Page 78: ...78 CHAPTER 4 SIMPLE NETWORK MANAGEMENT PROTOCOL SNMP...
Page 100: ...100 CHAPTER 5 ETHERNET PORTS...
Page 174: ...174 CHAPTER 9 RESILIENT LINKS...
Page 322: ...322 CHAPTER 13 VIRTUAL ROUTER REDUNDANCY VRRP...
Page 476: ...476 CHAPTER 16 INTERNET PACKET EXCHANGE IPX...
Page 552: ...552 CHAPTER 18 QUALITY OF SERVICE QOS AND RESOURCE RESERVATION PROTOCOL RSVP...
Page 566: ...566 APPENDIX A TECHNICAL SUPPORT...
