Mailing List Archive

> Hi all,
>
> Quick question. We're setting up an M-40 with 2 gig-e
> interfaces so that
> failure of either interface (or the switch its plugged into)
> doesn't mean
> the M-40 is unavailable. We could setup VRRP between the
> interfaces, but
> there is about 20 (and growing) sub-interfaces that need to
> be failed over
> if one of the gig-e interfaces fail.
>
> Is there an easier way to keep the two interfaces in sync other than
> editing both interfaces by hand everytime a change has to be made?
>
> Thanks,
>
> Rich

Rich,

VRRP is not an option as it would require you to configure two
IP-adresses in the same segment on one router. That won't work..
A better option is to use Etherchanneling from your M40 to the switch
provided that the switch supports it..

Hope this helps..

Nils Kolstein
Senior Netwerkbeheerder
KPN Planet Technologies
Tel: 030-6588284
Fax: 033-4513101
E-mail: n.kolstein@planettechnologies.nl

Rich,

Use link aggregation - 802.3ad (MLT, EtherChannel etc..);

Use a 'virtual' Aggregated Ethernet interface - ae*.
You can also use Sonet interfaces, but I have never tried.

[edit interfaces]
ae0 {
vlan-tagging;
unit 0 {
vlan-id 100;
family inet {
address 10.1.1.1/24;
}
}
}

[edit chassis]
aggregated-devices {
ethernet {
device-count 2; <- 2 in this case
}
}

[edit interfaces]
ge-1/3/0 {
gigether-options {
802.3ad ae0;
}
}

[edit interfaces ae0 ]
aggregated-ether-options {
link-speed 1g;
minimum-links 5;
}

HTH


-----Original Message-----
From: variable@ednet.co.uk [mailto:variable@ednet.co.uk]
Sent: 21 May 2003 14:29
To: juniper-nsp@puck.nether.net
Subject: [j-nsp] Interface mirroring?


Hi all,

Quick question. We're setting up an M-40 with 2 gig-e interfaces so that
failure of either interface (or the switch its plugged into) doesn't mean
the M-40 is unavailable. We could setup VRRP between the interfaces, but
there is about 20 (and growing) sub-interfaces that need to be failed over
if one of the gig-e interfaces fail.

Is there an easier way to keep the two interfaces in sync other than
editing both interfaces by hand everytime a change has to be made?

Thanks,

Rich

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On Wed, May 21, 2003 at 03:33:50PM +0100, Neil Stirling wrote:
> Rich,
>
> Use link aggregation - 802.3ad (MLT, EtherChannel etc..);

...just make sure that the switch you're plugging this into does load
balancing well enough. Cat5500, for example, would use source/dest MAC hash
to do the LB, which will work pretty badly when most of the traffic is
between couple of MACs (your router and an injecting gateway, for example).

[skip]

---end quoted text---

SY,
--
D.K.