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Posted by on April 19, 2006, 12:57 pm
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hello,
i have a few questions about alteons and vrrp (active/standby
failover). if we have 2 alteons in the configuration, each has 2
interfaces - one the outside(virtual server) and one inside(facing the
real servers). These also have vrrp addresses configured. The master we
give each one priority 101 and the standby left at default.
1) What is the difference between enabling the 'group' settting in vrrp
or not having it, does it mean if you dont enable it, you could
effectively have one active vrrp on one alteon and one active vrrp on
another?
2) For each vrrp, you can say what you want to track on. i.e. reals,
ports etc, how does this work and why would you use it,this does not
seem to have any effect when using the group method.
3) In what cirumstance would you enable more priority on an individual
vrrp address?
Thanks for any help.
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Posted by Dophi on April 19, 2006, 10:16 pm
for your questions;
1) A group aggregates all virtual routers you asign and these virtual
routers will failover as a group, and cannot failover individually. It
is usually used for routing purposes.
2) A track affects VRRP function a lot. The VRRP on Alteon is different
from traditional VRRP at other platforms. Each track is an factor for
calculating priority of virtual router. Once you setup a wrong priority
or track, the VRRP failover might not success.
3) Do you know why the person who setup these Alteon's gave priorities
as 101 and 100? Each track or interface has 2 points for calculating
VRRP priority. Once an interface goes down, that priority will be 101-2
= 99 and this triggers VRRP failover on both Alteon's.
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Posted by on April 20, 2006, 7:06 am
Ok thankyou. The alteon1 has higher prirority as it is defined as
master- what happens when the priority of a vrrp is the same - how does
it decide which one to use? I thought in active-stanby one must be
higher normally. Also does the group setting overide any track settings
you have for individual vrrp addresses? I seem to remember it did.
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Posted by Dophi on April 20, 2006, 12:08 pm
When the priorities on both Alteon's are the same in a VLAN, both of
them might be masters or slaves and this will cause clients connected
to Alteon get confused. Routing at different VLAN's will be failed.
Never let the priorities of Alteon's be the same in a VLAN. If you want
to know how it decide to be a master or slave, please refer to RFC 2338
and 3768 for detail information.
The gourp setting never really overides any track settings. When group
enabled, all virtual routers behave as one entity, and all group
settings override any individual virtual router settings or
service-based vrgroup settings. Once one member of a VRRP group fails,
the priority of the group decreases, and the state of the entire switch
changes from master to backup.
For example, the interface of VLAN 1 is down and the virtual router of
VLAN 1 is grouped with another one of VLAN 2. At this time, both
virtual routers of VLAN 1 and 2 go down no matter the interface of VLAN
2 is up or down. Why do we like to setup this? Because we don't want
the interface 2 deal with any routing packets when interface 1 which
connects to a default gateway is down.
As your mentioned, you would like to have one active VRRP on one Alteon
and one active on another one. You can do it, and it's an
"Active-Active" mode. But each VSR on different Alteon should provide
different service. i.e. HTTP service VSR on Alteon 1 and FTP service
VSR on Alteon 2. Which means, Alteon 1 is the active device to
responce HTTP request and Alteon 2 is avctive device to reponce FTP
service at the same time.
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