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18
Virtual Router Redundancy Protocol
where the configured priority is the same on several group members, then the
master router with the highest IP address is selected from this group.
• If you have multiple secondary addresses configured on the current VLAN
interface, you can add any of these addresses to the virtual router group.
• The interfaces of all routers participating in a virtual router group must be within the
same IP subnet.
• VRRP creates a virtual MAC address for the master router based on a standard
prefix, with the last octet equal to the group ID. When a backup router takes over
as the master, it continues to forward traffic addressed to this virtual MAC address.
However, the backup router cannot reply to ICMP pings sent to addresses
associated with the virtual group because the IP address owner is off line.
Virtual Router Priority –
• The Owner of the virtual IP address is automatically assigned the highest possible
virtual router priority of 255. The backup router with the highest priority will become
the master router if the current master fails. However, because the priority of the
virtual IP address Owner is the highest, the original master router will always
become the active master router when it recovers.
• If two or more routers are configured with the same VRRP priority, the router with
the higher IP address is elected as the new master router if the current master fails.
Preempting the Acting Master –
• The virtual IP Owner has the highest priority, so no other router can preempt it, and
it will always resume control as the master virtual router when it comes back on
line. The preempt function only allows a backup router to take over from a master
router if no router in the group is the virtual IP owner, or from another backup router
that is temporarily acting as the group master. If preemption is enabled and this
router has a higher priority than the current acting master when it comes on line, it
will take over as the acting group master.
• You can add a delay to the preempt function to give additional time to receive an
advertisement message from the current master before taking control. If the router
attempting to become the master has just come on line, this delay also gives it time
to gather information for its routing table before actually preempting the currently
active master router.
Field Attributes
(VRRP Group Configuration)
• VLAN ID
– ID of a VLAN configured with an IP interface. (Range: 1-4093; Default: 1)
• VRID
– VRRP group identifier. (Range: 1-255)
• State
– VRRP router role. (Values: Master, Backup)
• Virtual Address
– Virtual IP address for this group.
• Interval
– Interval (in seconds) at which the master virtual router sends
advertisements communicating its state as the master.
• Preemption
– Shows if this router is allowed to preempt the acting master.
• Priority
– Priority of this router in the VRRP group.
• AuthType
– Authentication mode used to verify VRRP packets from other routers.
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Страница 6: ...ii ...
Страница 34: ...Getting Started ...
Страница 44: ...Introduction 1 10 1 ...
Страница 62: ...Initial Configuration 2 18 2 ...
Страница 64: ...Switch Management ...
Страница 76: ...Configuring the Switch 3 12 3 ...
Страница 118: ...Basic Management Tasks 4 42 4 ...
Страница 164: ...User Authentication 6 28 6 ...
Страница 176: ...Access Control Lists 7 12 7 ...
Страница 284: ...Quality of Service 14 8 14 ...
Страница 294: ...Multicast Filtering 15 10 15 ...
Страница 300: ...Domain Name Service 16 6 16 ...
Страница 310: ...Dynamic Host Configuration Protocol 17 10 17 ...
Страница 320: ...Configuring Router Redundancy 18 10 18 ...
Страница 344: ...IP Routing 19 24 19 ...
Страница 356: ...Unicast Routing 20 12 20 Web Click Routing Protocol RIP Statistics Figure 20 5 RIP Statistics ...
Страница 386: ...Unicast Routing 20 42 20 ...
Страница 388: ...Command Line Interface ...
Страница 400: ...Overview of the Command Line Interface 21 12 21 ...
Страница 466: ...SNMP Commands 24 16 24 ...
Страница 520: ...Access Control List Commands 26 18 26 ...
Страница 546: ...Rate Limit Commands 30 2 30 ...
Страница 612: ...VLAN Commands 34 24 34 ...
Страница 626: ...Class of Service Commands 35 14 35 ...
Страница 670: ...DHCP Commands 39 16 39 ...
Страница 716: ...IP Interface Commands 41 36 41 ...
Страница 768: ...IP Routing Commands 42 52 42 ...
Страница 770: ...Appendices ...
Страница 791: ......
Страница 792: ...20 Mason Irvine CA 92618 Phn 949 679 8000 www smc com 150200062800A R02 149100000035A R01 SMC8926EM SMC8950EM ...