From: Clifton Stewart (cliftonlstewart@xxxxxxxx)
Date: Mon Oct 29 2001 - 02:51:08 GMT-3
Ryaboy,
Let me take a crack at this :}
Without the bandwidth statement all serial interface default to a T1 (1544)
You want to use this statement to utilize the actual bandwidth as specified
with your service provider. In addition protocols like OSPF and EIGRP rely on
the bandwidth when selecting the best paths.
Dialer-load threshold 1, is so that both b-channels are brought up
immediately.
PPP Multilink creates a virtual template inside the router to bind the two
b-channels together. So instead of using 1 b-channel at the rate of 64k, you
now have two at 128k.
As far as the map or dialer statements either is okay. Remember that the map
statement accomplishes the same thing as the frame-relay map statement on
NBMA networks. Specifies where broadcast traffic should be directed. Think
about it this isn't an issue on ethernet because the host usually resides
somewhere on the subnet and is resolved by ARPing.
Guys you can let me know if I'm on target here, or if you have something to
add, let's do it!
-Cliff
Ryaboy Vadim wrote:
> I've got everything working.
> And I have very basic isdn config:
>
> interface BRI0
> ip address 212.1.22.98 255.255.255.224
> dialer string 8358662
> dialer-group 1
> isdn spid1 0835866101 8358661
> isdn spid2 0835866301 8358663
>
> Config in the answer:
>
> interface BRI0
> ip address 212.1.22.34 255.255.255.240
> encapsulation ppp
> ! You should always try to remember to use bandwidth statements on serial
> ports (BY THE WAY - WHY?)
> bandwidth 128
> isdn spid1 0835866101 8358661
> isdn spid2 0835866301 8358663
> dialer map ip 212.1.22.33 broadcast 8358662
> dialer load-threshold 1 either
> dialer-group 1
> no fair-queue
> ppp multilink
> no shutdown
>
> Why do I need
> 1)ppp and
> 2)dialer load-threshold 1 either
> 3)bandwidth
> 4)ppp multilink?
> 5) DO I need dialer map or I can use dialer string (like in my config)?
> Is all that needed or can be omitted?
>
>
> Thank you.
> Vadim.
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