[j-nsp] junos vrrp and ucarp interoperability

[ProServe - Peter Batenburg]

On Mon, 15 Aug 2005, Marco Hogewoning wrote:

> Does anybody here has some experience with running CARP (http://www.ucarp.org/)
> and VRRP on the same network. Our plan is to crossconnect 2 carp speaking
> boxes (OpenBSD) and 2 M-series, using VRRP and CARP on the same ethernet
> to build a failover situation.
> Earlier IAB meetings suggest that there might be parameter clashes between
> the 2 protocols.
> Any pointers to these problems, test results or pitfalls when configuring
> it are welcome.

The thing you have to keep in mind is, that CARP is built on the same 
specs as VRRP (AFAIK).
The problem we had after a customer connected 2 boxes with CARP, was that 
CARP used the same virtual MAC as our 2 Junipers used for the virtual VRRP 
IP address. I don't know how the configuration of CARP works, but we 
resolved it by using a higher vrrp-group number. This makes the virtual MAC 
different then the CARP one.
Other than that, we had no problems with CARP and VRRP setups.

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