From: Bob Chahal (bob.chahal@xxxxxxxxxxxx)
Date: Sun Sep 16 2001 - 12:32:26 GMT-3
I know what you're saying but lets say for example the device is on an
ethernet segment with a mac address of 4444.3333.2222 and you want to
configure an icanreach statement that prevents explorers for this mac
address you have to convert the cannonical mac address into non-canonical.
dlsw icanreach 2222.cccc.4444
Another way of putting this is (forgetting any multicast mac address
clashes)
HostA---ethernet---R1------DLSW-------R2----token-ring-----HostB
HostA: macaddr 1111.1111.1111
HostB: macaddr 2222.2222.2222
if you wanted to prevent explorers for both the Host devices you would
configure
R1
dlsw local peer 1.1.1.1
dlsw remote 0 tcp 1.1.1.2
dlsw bridge 1
dlsw icanreach 8888.8888.8888
!
bridge 1 pro ieee
!
int e0
bridge-group 1
R2
dlsw local peer 1.1.1.2
dlsw remote 0 tcp 1.1.1.1
dlsw icanreach 2222.2222.2222
!
source-bridge ring 10
!
int to0
source-bridge 1 1 10
source-bridge spanning
If HostB is an SNA mainframe then HostA will have a hard configured MAC
address for the Mainframe as 4444.4444.4444. When Host A sends an explorer
for 4444.4444.4444 the DLSW router converts the mac adress to non-canonical
(2222.2222.2222) and replies to the explorer as it has the mac address in
its cache.
Another example could be if HostA is a key Netbios server and HostB sends
and explorer to 8888.8888.8888. It is RouterA that converts this to
1111.1111.1111 when the frame passes onto the ethernet segment to HostA.
----- Original Message -----
From: "Devender Singh" <devender.singh@cmc.cwo.net.au>
To: "Bob Chahal" <bob.chahal@ntlworld.com>; <ccielab@groupstudy.com>
Sent: Sunday, September 16, 2001 1:19 PM
Subject: RE: Bootcamp Lab 19 - DLSW
> Bob,
> I disagree, may be I am wrong. But I think dlsw talks only non-cannonical
> format. Cannonical formats should be only used when configuring ehternet
> interfaces for redundancy.
>
> Devender Singh
> BE(Hons), CCNP
> IP Solution Specialist
>
>
> -----Original Message-----
> From: Bob Chahal [mailto:bob.chahal@ntlworld.com]
> Sent: Sunday, 16 September 2001 8:38
> To: ccielab@groupstudy.com
> Subject: Bootcamp Lab 19 - DLSW
>
>
> Hi all,
>
> I've searched the archives and no one seems to have picked up on the q5 in
> task two.
>
> You are asked to configure a static resource on R6 for MAC address
> 4444.3333.2222. Since this router has only an ethernet configured as part
of
> DLSW then this resource would be an ethernet device. so shouldn't you be
> converting the address into non-canonical and configure as follows
>
> dlsw icanreach 2222.cccc.4444
>
> If this kind of thing comes up on the real lab I guess I'll ask the
proctor
> for clarification. And the same applies for q3 as this address range
> 3003.3003.xxxx could be for ethernet of token ring devices as the DLSW
> config includes both interface types.
>
> Anyone agree or disagree. Appreciate nay comments.
>
> Thanks
>
> Bob
> **Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
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