From: Gregg Malcolm (greggm@xxxxxxxxxxxxx)
Date: Thu Apr 11 2002 - 15:14:12 GMT-3
I'm a little confused about the solution that Networkforce is proposing.
I'm open to correction as usual but I don't see secondaries as the best
solution. The only situation that I'll use secondary addresses is if
someone has a gun to my head and forces me. One situation was subnet
overloading on an Ethernet. Client wanted more than 254 hosts on the VLAN
and they were running RIP1. I tried to talk them out of it but they were
determined. Plus the VLAN was DHCP which opens up another can of worms with
secondaries.
The problem as I see it with secondaries is that many protocols use the
primary address of the interface for broadcasts. If there is any other
possible solution, I will use it instead of secondaries. Unless someone has
a gun to my head.
Even getting EIGRP to work with secondaries takes a little thought. From
CCO :
<snip>
Q. Does EIGRP support secondary addresses?
A. EIGRP does support secondary addresses. Since EIGRP always sources data
packets from the primary address, we recommend that you configure all
routers on a particular subnet with primary addresses that belong to the
same subnet. Routers will not form EIGRP neighbors over secondary networks,
therefore, if all routers' primary IP addresses do not agree, problems can
arise with neighbor adjacencies.
Just my take. I'm curious what others think of secondaries.
Gregg
----- Original Message -----
From: "Williams, Glenn" <WILLIAMSG@PANASONIC.COM>
To: "'Lupi, Guy'" <Guy.Lupi@eurekaggn.com>; <ccielab@groupstudy.com>
Sent: Thursday, April 11, 2002 10:00 AM
Subject: RE: Duplicate DLCIs
> That is real close. Networkforce showed 2 sub interfaces at hub though so
I
> don't know how they intend to do that. Can you clarify what you mean that
> OSPF from R6 to R2 is not able to run?
> GW
>
> -----Original Message-----
> From: Lupi, Guy [mailto:Guy.Lupi@eurekaggn.com]
> Sent: Thursday, April 11, 2002 10:46 AM
> To: Williams, Glenn; 'ccielab@groupstudy.com'
> Subject: RE: Duplicate DLCIs
>
>
> Here is my config, I don't know if this is what you were looking for.
This
> works, the secondary address is on r2 because r6 will source any icmp with
> the primary ip address of the interface closest to the destination, which
in
> my case was 10.1.1.6. Of course, you wouldn't be able to run OSPF on r6
to
> r2, unless you used a tunnel. Eigrp works out well though.
>
> HTH
>
> Guy
>
>
> r5------r6-------r2
>
>
> R2
>
> interface Serial0
> no ip address
> encapsulation frame-relay
> no fair-queue
> !
> interface Serial0.1 point-to-point
> ip address 10.1.1.2 255.255.255.0 secondary
> ip address 23.0.0.2 255.255.255.0
> ipx network 123
> frame-relay interface-dlci 266
>
> R5
>
> interface Serial0
> no ip address
> encapsulation frame-relay
> no fair-queue
> !
> interface Serial0.1 point-to-point
> ip address 10.1.1.5 255.255.255.0
> ipx network 123
> frame-relay interface-dlci 566
>
> R6
>
> interface Serial0
> ip address 23.0.0.6 255.255.255.0 secondary
> ip address 10.1.1.6 255.255.255.0
> no ip directed-broadcast
> encapsulation frame-relay
> no ip mroute-cache
> ipx network 123
> no fair-queue
> frame-relay map ipx 123.0010.7b7f.ce10 662 broadcast
> frame-relay map ip 10.1.1.5 665 broadcast
> frame-relay map ip 23.0.0.2 662 broadcast
> frame-relay map ipx 123.0010.7b36.e1dd 665 broadcast
>
> -----Original Message-----
> From: Williams, Glenn [mailto:WILLIAMSG@PANASONIC.COM]
> Sent: Thursday, April 11, 2002 10:37 AM
> To: 'ccielab@groupstudy.com'
> Subject: Duplicate DLCIs
>
>
> Want to know if this can be done.
>
> R1 ---(F/R)-----R2 -------(F/R)-------R3
>
> R2 is hub. I want point to multipoint for a IPX network. All frame
> connections using same IPX network, say IPX network 123. But I also want
> two individual point-to-point IP networks. We will say 12.0.0.0 network
> from R1 to R2 and 23.0.0.0 from R2 to R3.
>
> I can not create the DLCIs to do this because I get an error that says
DLCI
> already exists when I have already mapped it for IPX and want to map it
> again under new sub interface for IP. I tried putting a secondary IP
> address under the multipoint, but doesn't ping too well.
>
>
> Any ideas or won't this work? Obviously there is something I don't
> understand about frame relay.
>
> GW
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:58:05 GMT-3