It looks like there is a limitation as to the number of times you can
inherit settings from a particular vrrp-group on a single interface, but
is this correct?
Assume you have a single vlan with multiple IP subnets configured.
However, all you need is to have a single vrrp-group where all of the
other IP subnets can inherit vrrp config information from, let's say, the
vrrp group with the preferred address. For example:
[edit interfaces irb unit 100]
MX# show
family inet {
address 192.168.37.3/25 {
preferred;
vrrp-group 100 {
priority 125;
accept-data;
virtual-address 192.168.37.1;
}
}
address 192.168.38.3/25 {
vrrp-group 101 {
virtual-address 192.168.38.1;
vrrp-inherit-from {
active-interface irb.100;
active-group 100;
}
}
}
address 192.168.39.3/25 {
vrrp-group 102 {
virtual-address 192.168.39.1;
vrrp-inherit-from {
active-interface irb.100;
active-group 100;
}
}
}
}
For each IP address configured on the IRB interface (associated with one
particular vlan), you must have a DIFFERENT vrrp-group configured, even
though the "inheriting" addresses are only effectively using the
vrrp-group number as unique identifiers and place holders.
If you try to use the SAME vrrp-group number for each address; e.g. "100",
you get a configuration error upon commit:
"Duplicate interface: irb unit: 100 vrrp-group: 100 for address:....."
Vrrp has a limitation as to the nunmber of groups available per vlan, 255.
Granted, having more than 255 addresses per interface is a lot, but it
seems arbitrary that the MX limits you to only having 255 IP subnets per
vlan that can use VRRP.
Having a maximum of 255 VRRP active groups per vlan makes sense, as this
is what the VRRP standard specifies, but when you have a bunch of
basically "inactive" groups that inherit from one active group, it seems
bizarre that Junos says, "NOPE, you can only have a maximum of 254
placeholders for inactive vrrp groups per interface."
Am I misunderstanding something here?
Clarke Morledge
College of William and Mary
Information Technology - Network Engineering
Jones Hall (Room 18)
Williamsburg VA 23187
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