From: Kevin Gannon (kevin@xxxxxxxxxxx)
Date: Mon Mar 06 2000 - 14:47:48 GMT-3
>From the proctors view point I do not know what is the "correct" way.
However based
on experience the backup command is not to be recommened , the reason is
cost if the
backup command kicks in then you keep the ISDN up _always_ until the link is
restored.
You might say that the routing protocols would do this anyway but OSPF on
demand on
the dialer interface should sort this out. When there is no traffic the ISDN
link will shut down
until needed.
Also the floating statics cope with more failure situations in particular
frame relay failures within
the telco cloud.
When the customer says they do not care about the ISDN bill they will not
say this when they
get a £20,000 phone bill because there link has been down for a month !
Regards,
Kevin
----- Original Message -----
From: "Khurram Khani" <ajmal@emirates.net.ae>
To: "Muralidhar Devarasetty" <dhar_murali@hotmail.com>;
<ccielab@groupstudy.com>
Sent: Tuesday, March 07, 2000 3:43 AM
Subject: Re: DDR - two way backup
> One way backup between two points is fine.
>
> If the question asks me to provide two way backup between
> two point, can I still use backup interface instruction with dialers
> on the two routers?? Or I must go for floating static routes. Coz
> once I put backup int and interface goes in StandBy mode now if the
> line protocol on Serial Link goes DOWN at Spoke Side and the protocol
> on HUB is UP then HUB will keep its ISDN line in StandBy Mode if
> backup int used for BRI.
>
> Tips for the situation requested.
>
> Khurram.
>
>
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