
Nortel Switched Firewall 2.3.3 User’s Guide and Command Reference
120
Redundant Firewalls
213455-L, October 2005
Active link is down.
Port is down.
High traffic spreads advertisement packets beyond the specified
adint
interval.
A device on the virtual router LAN blocks the advertisement packets or ARP traffic.
N
OTE
–
VRRP miss-handles failures due to externally blocked multicast traffic. It results in
both units assuming the active role. Note also that backups do not block traffic.
VRRP failover
VRRP failover occurs when the backup fails to receive advertisement packets at pre-set
intervals from each interface on the active master.
If VRRP multicast advertisement packets to group address 224.0.0.18 are not
received by any virtual router on the backup, all of the backup virtual routers will
send four ARP requests (one per second) to the active master virtual router IP
addresses. The intention is to give the active master ample opportunity to respond, to
ensure that it is down before going on to the next step.
If ARP replies from the active master are not received, failover occurs (the backup
virtual router assumes the role of active master).
If ARP replies from the active master are received, no failover occurs.
This phenomenon may indicate that traffic on the active master is too heavy for it to
send advertisement packets within the
adint
window. If you believe this is the case,
increase the
adint
value (see the
/cfg/net/vrrp/adint
command on
page 335
).
N
OTE
–
When a virtual router comes up from the fault state, it will ARP for an active master.
If the virtual router receives an ARP response, it will assume the role of backup. The backup
will continue sending ARP messages to the virtual router until it does not receive a response. It
will then initiate the failover process.
If the MIP ownership is assigned to the VRRP master and a failover takes place, the SSI
restarts to allow the MIP ownership to migrate to the new VRRP master. MIP ownership need
not be assigned to the VRRP master. System error messages appear at the CLI and the BBI
until MIP migration completes.
Содержание 5100 Series Release 2.3.3
Страница 18: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 18 Preface 213455 L October 2005...
Страница 20: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 20 Getting started 213455 L October 2005...
Страница 28: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 28 Introduction 213455 L October 2005...
Страница 90: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 90 Initial setup 213455 L October 2005...
Страница 188: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 188 Redundant Firewalls 213455 L October 2005...
Страница 228: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 228 Applications 213455 L October 2005...
Страница 248: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 248 Basic system management 213455 L October 2005...
Страница 250: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 250 Command reference 213455 L October 2005...
Страница 264: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 264 The Command Line Interface 213455 L October 2005...
Страница 374: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 374 Command reference 213455 L October 2005...
Страница 376: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 376 Appendices 213455 L October 2005...
Страница 406: ...Nortel Switched Firewall 2 3 3 User s Guide and Command Reference 406 Common tasks 213455 L October 2005...