From: Dufour, Andre (Andre.Dufour@PAETEC.com)
Date: Tue Mar 17 2009 - 12:07:33 ART
Hello Victor,
From what I understand, NetFlow, left in it's default state, only collects data inbound to an interface.
What are your exact NetFlow configs?
Regards,
Andre
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Victor
Sent: Tuesday, March 17, 2009 10:42 AM
To: Cisco certification; Cisco certification
Subject: Fwd: Netflow V5 issue (Pls help)
Hi Everybody,
I wonder if someone can help me.
Thanks in advance.... Johan Victor
---------- Forwarded message ----------
From: Victor <cisco.all.stuff@gmail.com>
Date: Mar 14, 2009 8:45 PM
Subject: Re: Netflow V5 issue [7:134715]
To: cisco@groupstudy.com
Hi Andre,Thank you very much for your kind answer. Maybe I wasn't clear in my question....sorry.....my doubts are related especifically to Netflow....
to Netflow functioning.... I need to know if the normal behavior in this case is to not see Outbound traffic through Netflow in the Standby router.
Just to add more data.... BGP on both routers is configured correctly, using local preference and weight, so the preferred path always be the Primary router (HSRP is only an add ).
I hope now is clearer and I can get some advise.
Thanks & Brgds.... Johan Victor.
On Fri, Mar 13, 2009 at 10:06 PM, Dufour, Andre wrote:
> Hello Johan,
>
> HSRP cannot determine outbound traffic. It is meant to provide 1st
> hop-redundancy for end-users. Both routers, via their routing tables,
iBGP
> in this case, will determine what router the traffic leaves on,
> regardless of which router is the HSRP active one. You should be
> using Local Preference within your AS to determine outbound. It would
> be optimal to tweak HSRP to match as best as you can, the a primary
> iBGP router but it
is
> not necessary in most cases.
>
> The path that outbound traffic leaves does not determine what path the
data
> will take inbound; you should use as-path to help influence that.
> Routing must be ensures, on a per-hop-basis, in both directions.
> Local AS for outbound and AS-Path for inbound generally works.
>
> Let us know if that helps.
>
> Feel free to add more details regarding the traffic that you see.
>
> Regards,
> Andre
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Victor
> Sent: Friday, March 13, 2009 6:19 PM
> To: Cisco certification; Cisco certification
> Subject: Netflow V5 issue
>
> Hi Guys,
> I've some mission cirtical sites that have the following config: 2
> routers with iBGP between them and also HSRP, eBGP with provider, they
> work one active and the other one standby. All those routers have
> Netflow V5 configured and I can observe that the secondary ones have
> traffic INBOUND but not OUTBOUND, nevertheless I can see flows on both
> (primary and secondary), at least BGP and a little amount of admin
> traffic with command.
> My question is: is that a normal behaviour?? Should I observe traffic
> inbound and outbound even if this router is in standby mode?
>
> Thanks and Regards.... Johan Victor.
>
>
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