Re: BGP

Marish, that is interesting. I was sure your neighbor ip address did not
match the physical interface that packets were being sent from. It may be
alright as long as one side matches. I have to ran into some strange issues
with dynamips and never hesitate to save/reboot.

Good luck,

Bryan Bartik
CCIE #23707, CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com

On Thu, May 7, 2009 at 5:42 AM, marish shah <contactmarish_at_gmail.com> wrote:

> Hi Bryan,
> I didn't mean that we only use Update source in loop back case.yes
> but my statement shows that.Actually I have to write like that in this case
> we don't need update source because I'm not using any loop back and neither
> any other physical on which the source make a problem . And this problem is
> not related to configuration it was from dynamips I just save all
> configuration and restart my dynamips and its work fine .So it seems that
> there is some bugs also in dynamips ?
>
>
> On Wed, May 6, 2009 at 8:32 PM, Bryan Bartik <bbartik_at_ipexpert.com> wrote:
>
>> Marish,
>>
>> I think you should reconsider the statement "we only update source when we
>> r using loop back address but I'm using physical address." Is that really
>> the only case? :-) You should try some debugging to compare the addresses
>> being used for BGP packets to the IP addresses you have configured for BGP
>> neighbors. Debugging ip bgp or debugging ip packet with an ACL matching port
>> 179 may help.
>>
>> Bryan Bartik
>> CCIE #23707, CCNP
>> Sr. Support Engineer - IPexpert, Inc.
>> URL: http://www.IPexpert.com
>>
>> On Wed, May 6, 2009 at 9:32 AM, marish shah <contactmarish_at_gmail.com>wrote:
>>
>>> Hi
>>> I think Ravi we only update source when we r using loop back address
>>> but I'm using physical address so in this case no need for update source
>>> command. And as I mention above static route through R1 - R6 - SW1 is
>>> working fine . But when remove static from there and create from R1 - R3
>>> -
>>> SW1 its not working . So when I look close to my configuration I found
>>> that
>>> there is some routing configuration mistake in eigrp So I correct it but
>>> still same result I also do Clear but no benefit .Ok let me try to
>>> explain
>>> my topology I'm using IEW lab I verion 5
>>>
>>> R6..Fas0/0.146>155.1.146.6 is connected with R1..Fas0/0>155.1.146.1.Then
>>> R1..Ser1/0>155.1.13.1 is connected with R3..Ser1/3>155.1.13.3.Then
>>> R3..E0/0>155.1.37.3 is connected with SW1..Fas1/3>155.1.37.7.And
>>> SW1..Vlan67>155.1.67.7 is connected with R6...E0/1>155.1.67.6.
>>> R6----R1----R3---SW1
>>> | |
>>> |_____________ |
>>>
>>> So I experience today It is shows that you should do BGP relationship
>>> through that path from which you r getting routes via IGP.
>>>
>>> Any seggeations ......Please.
>>>
>>>
>>> Thanks.
>>>
>>>
>>> On Wed, May 6, 2009 at 5:17 PM, Ravi Singh <way2ccie_at_googlemail.com>
>>> wrote:
>>>
>>> > HI Marish,
>>> >
>>> > Have you configured the update-source command in your BGP config. My
>>> > guess is that when you are configuring the static towards SW1 , the
>>> > source address of the BGP packet will be of the interface that you
>>> > have configured as the peering address of R1. While when R1 is
>>> > dynamically learning the information through EIGRP the source address
>>> > is different than what the BGP process is expecting it to. Also, what
>>> > addresses are you using for the peering. Physical addresses or
>>> > loopbacks ??
>>> >
>>> > Ravi
>>> >
>>> > On Wed, May 6, 2009 at 2:56 PM, marish shah <contactmarish_at_gmail.com>
>>> > wrote:
>>> > > Hi Expert,
>>> > > Im doing BGP lab I create BGP neigh relationship between R1
>>> and
>>> > > SW1 but its not coming I also run eigrp because it is not
>>> > > directly neigh so from eigrp I'm getting route of SW1 and I'm also
>>> able
>>> > to
>>> > > ping but in bgp sh ip bgp summ command R1 status with Sw1 is active
>>> > .means
>>> > > there is no bgp neigh relation.
>>> > > Actually from R1 there is two path to reach Sw1
>>> > >
>>> > > SW1 - R6- R1-connected with R3 and R3 - Sw1 mean there is ring
>>> topology
>>> > >
>>> > > R1 getting routes from Sw1 via R3 and I create and my bgp neigh
>>> from
>>> > R1 -
>>> > > R6 - sw1
>>> > >
>>> > > So my Q is that is bgp neigh relation is also depend on IGP
>>> > > path selection.Because when I create static to words Sw1 by using
>>> same
>>> > path
>>> > > where I configure my BGP neigh relation its work R1 - R6 - Sw1 its
>>> work
>>> > > fine.
>>> > > But removing static neigh state becomes again active because eigrp
>>> > getting
>>> > > sw1 routes via R3 .. R1 - R3 -Sw1
>>> > >
>>> > > Thanks.
>>> > >
>>> > >
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>>> > >
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>>
>>
>> --
>>
>>
>

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