Re: [tipc-discussion] Request: Unable to config second node onsamemachine

[Stephens, A. <all...@wi...>]

Hi Naresh:

I think Surya's response explains the situation pretty well. Let us know
if you have further questions.

Regards,
Al 

> -----Original Message-----
> From: Suryanarayana Garlapati [mailto:SGa...@go...] 
> Sent: Thursday, August 26, 2010 2:38 AM
> To: nar...@wi...; Stephens, Allan
> Cc: jon...@er...; tip...@li...
> Subject: RE: [tipc-discussion] Request: Unable to config 
> second node onsamemachine
> 
> Hi Naresh,
> For the scenario 3:
> > scenario 3: two Ethernet interfaces eth0, eth1
> > 
> > Machine-1                                   Machine-2
> > |------------- |                             |---------------|
> > |  <1.1.1>  |                             |<1.1.2>     |
> > |     eth0     |       ???                 | eth0          |
> > |     eth1     |       ???                 | eth1          |
> > ---------------                               ----------------
> 
> TIPC expects that there is connectivity between eth0-eth0 and 
> eth1-eth1 and there is no intermixing among them(means 
> totally distinct Ethernet segements (or independent LANs, if 
> you prefer)).
> See the diagram below
> 
>  Machine-1                                   Machine-2
>  |------------- |                             |---------------|
>  |  <1.1.1>  |                          |<1.1.2>     |
>  |     eth0     | <-------------------> | eth0          |
>  |     eth1     | <-------------------> | eth1          |
>  ---------------                               ----------------
> 
> Say connectivity between eth0-eth0 is broken, then TIPC 
> messaging will be done on the eth1-eth1 link. TIPC 
> automatically does the link changeover, when it detects the 
> failure on one link.
> 
> Regards
> Surya
> 
> 
> > -----Original Message-----
> > From: nar...@wi... [mailto:nar...@wi...]
> > Sent: Thursday, August 26, 2010 11:54 AM
> > To: all...@wi...
> > Cc: jon...@er...; Suryanarayana Garlapati; tipc- 
> > dis...@li...
> > Subject: RE: [tipc-discussion] Request: Unable to config 
> second node 
> > onsame machine
> > 
> > 
> > Allan wrote:
> > >
> > >As Jon Maloy stated in his reply, if you want a node to have 
> > >redundant TIPC interfaces to Ethernet they have be on totally 
> > >distinct Ethernet segements (or independent LANs, if you 
> prefer). You 
> > >can picture this
> > as:
> > >
> > >              |---<1.1.1>---|
> > >              |             |
> > >              |---<1.1.2>---|
> > >             |             |
> > >              |---<1.1.3>---|
> > >            eth0          eth1
> > >             LAN           LAN
> > >
> > >While you might be able to get some redundancy by eliminating the 
> > >distinct segments requirement, as in the following case:
> > >
> >  >             |---<1.1.1>---|
> > >              |             |
> > >              |---<1.1.2>---|
> > >              |             |
> > >              |---<1.1.3>---|
> > >              |             |
> > >              +-------------+
> > >                single LAN
> > >
> > >you wouldn't be protected in the case that a single defective 
> > >Ethernet interface starts babbling away on the LAN and 
> corrupts all 
> > >traffic
> > being
> > >sent on the LAN. Having the requirement for totally isolated LANs
> > means
> > >that you're protected even in this case.
> > 
> > valuable information. thanks.
> > let me give a picture of the same:
> > 
> > scenario 1: single Ethernet interface from eth0
> > 
> >   Machine-1                                  Machine-2
> > |------------- |                             |---------------|
> > |  <1.1.1>  |                              |<1.1.2>     |
> > |     eth0     |<-------------------->| eth0          |
> > ---------------                               ----------------
> > Connection established between (<1.1.1>eth0; <1.1.2>eth0) 
> working fine
> > 
> > scenario 2: single Ethernet interface from eth1
> > 
> > Machine-1                                   Machine-2
> > |------------- |                             |---------------|
> > |  <1.1.1>  |                              |<1.1.2>     |
> > |     eth1     |<-------------------->| eth1          |
> > ---------------                               ----------------
> > Connection established between (<1.1.1>eth1; <1.1.2>eth1) 
> working fine
> > 
> > scenario 3: two Ethernet interfaces eth0, eth1
> > 
> > Machine-1                                   Machine-2
> > |------------- |                             |---------------|
> > |  <1.1.1>  |                             |<1.1.2>     |
> > |     eth0     |       ???                 | eth0          |
> > |     eth1     |       ???                 | eth1          |
> > ---------------                               ----------------
> > 
> > In Scenario 3, what are the probabilities for effective ways of 
> > communicating  Machines by TIPC.
> > 
> > May i know the backup plan for the connection, i mean if connection 
> > lost from one Ethernet interface what could be the ways to re- 
> > establishing connection curious about the Link Changeover mechanism.
> > 
> > Best regards
> > Naresh Kamboju
> > 
> > >Regards,
> > >Al
> > 
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