From: MADMAN (dave@interprise.com)
Date: Wed Oct 23 2002 - 18:28:02 GMT-3
Here are the configs of the two routers, just enough to establish BGP,
nothing more. I also logged into a customer router that shows only
"new" in the bgp nei output but I can't look at the neighbor router
unfortuately.
7507:
router bgp 10
no synchronization
bgp log-neighbor-changes
network 33.0.0.0
neighbor 172.28.64.9 remote-as 11
no auto-summary
7206:
router bgp 11
bgp log-neighbor-changes
neighbor 172.28.64.11 remote-as 10
As you can see I haven't configured soft reconfig. Carlos Mendioroz
sent an interesting email stating that old may refer to a proprietary
pre standard router refresh though one would think that if both router
are capable they would negotiate one version, hopefully the standard.
Thanks
Dave
Brian McGahan wrote:
>
> Dave,
>
> I would assume that "old" route-refresh is soft-reconfiguration,
> and that "new" route-refresh is dynamic route-refresh.
>
> I get the following output with 12.1(12) though:
>
> Rack8R4#sh ip bgp nei 170.8.2.254 | in refresh
> Route refresh: advertised and received(new)
>
> There is no mention of "old" refresh in the output, and I cannot
> find a reference on CCO to it. I'll keep you posted if I find out any
> more info though.
>
> Brian McGahan, CCIE #8593
> Director of Design and Implementation
> brian@cyscoexpert.com
>
> CyscoExpert Corporation
> Internetwork Consulting & Training
> Voice: 847.674.3392
> Fax: 847.674.2625
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > MADMAN
> > Sent: Wednesday, October 23, 2002 2:52 PM
> > To: Brian McGahan
> > Cc: Liban.Mohamed@mail.sprint.com; ccielab@groupstudy.com;
> > rich@myhomemail.net
> > Subject: Re: bgp soft-reconfig in?
> >
> > I take it the route-refresh is the new, (12.1) dynamic inbound soft
> > reset which requires no new config. (I was checking out the URL you
> > provided:) So I set up a very basic BGP connection to see if this was
> > negociated, both routers are running 12.2xx but I'm not sure what this
> > output is saying and can't find it on CCO:
> >
> > C7206VXRB#sh ip bgp nei
> > BGP neighbor is 172.28.64.11, remote AS 10, external link
> > BGP version 4, remote router ID 172.28.64.11
> > BGP state = Established, up for 00:00:13
> > Last read 00:00:12, hold time is 180, keepalive interval is 60
> seconds
> > Neighbor capabilities:
> > Route refresh: advertised and received(old & new)
> >
> > What is the "Route refresh: advertised and received(old & new)"? I
> > assume the routers have negociated that they are capable of dynamic
> > reset, what is the old and new??
> >
> > Thanks
> >
> > Dave
> >
> >
> > Brian McGahan wrote:
> > >
> > > Soft-reconfig and route-refresh are two different
> technologies.
> > > They both accomplish pretty much the same thing, however they are
> > > implemented differently.
> > >
> > >
> http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_configur
> > > ation_guide_chapter09186a00800d97fc.html#xtocid9
> > >
> > > Route-refresh is preferable over soft-reconfig, since there
> is
> > > no additional configuration required, and it does not require any
> > > additional memory resources. Soft-reconfig inbound can be dangerous
> to
> > > use on a production BGP router, since inbound updates must be first
> > > cached, attributes applied, then flushed from memory. This means
> that
> > > if your router is short on memory, it could crash.
> > >
> > > For those of you with access to the Partner E-Learning
> > > connection, check out this link on multiprotocol extensions for BGP.
> It
> > > gives a good overview of route-refresh and ORF.
> > >
> > > http://cisco.partnerelearning.com/pec/trnevtdtl.asp?EvtID=39137
> > >
> > > HTH
> > >
> > > Brian McGahan, CCIE #8593
> > > Director of Design and Implementation
> > > brian@cyscoexpert.com
> > >
> > > CyscoExpert Corporation
> > > Internetwork Consulting & Training
> > > Voice: 847.674.3392
> > > Fax: 847.674.2625
> > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf
> > > Of
> > > > Liban.Mohamed@mail.sprint.com
> > > > Sent: Sunday, October 20, 2002 2:47 PM
> > > > To: ccielab@groupstudy.com; rich@myhomemail.net
> > > > Subject: RE: bgp soft-reconfig in?
> > > >
> > > > The dynamic inbound soft reset capability was added to
> > > > Cisco's BGP support in Cisco IOS Software Release
> > > > 12.0(6)T. BGP Soft Reset Enhancement is supported on
> > > > most Cisco router platforms up through the Cisco 7500
> > > > Series routers. Soft resets can be initiated without extra
> > > > commands using only the clear ip bgp in command.
> > > >
> > > >
> > > > Basically soft reconfiguration is to gracefully allow policies to
> be
> > > > configured and activated without "hardsetting" the bgp session.
> There
> > > > are
> > > > two kinds. Outbound and inbound. For inbound, all recieved routes
> are
> > > > stored
> > > > regardless of the fact whether they are accepted or denied. When
> we
> > > > clear
> > > > bgp with soft in, the polices are applied on the stored received
> path.
> > > > When we do clear bgp soft out, all entries in bgp table are re-run
> and
> > > > new
> > > > updates are generated to be sent out.
> > > > syntax:
> > > > 1. sh ip bgp neighbor <peer address> received-routes
> > > > This displays all the received updates from neighbor
> > > > 2. neighbor <address> soft-reconfiguration <in>
> > > > This will start storing the received updates. So required for
> INBOUND
> > > > soft
> > > > reconfig. Outbound reconfig does not need anything to be
> configured.
> > > >
> > > >
> > > >
> > > >
> > > > Thanks,
> > > >
> > > >
> > > > Liban Mohamed
> > > > IP Engineer
> > > > Sprintlink Internet BackBone
> > > > www.sprint.net
> > > >
> > > > -----Original Message-----
> > > > From: rich [mailto:rich@myhomemail.net]
> > > > Sent: Sunday, October 20, 2002 2:56 PM
> > > > To: ccielab
> > > > Cc: rich
> > > > Subject: bgp soft-reconfig in?
> > > >
> > > >
> > > > Is it true, when the neighbors support;
> > > >
> > > > Neighbor capabilities: (taken from sho ip bgp neighbor)
> > > > Route refresh: advertised and received
> > > > Address family IPv4 Unicast: advertised and received
> > > >
> > > > that you don't need to use the neighbor x.x.x.x
> soft-reconfiguration
> > > > inbound command? I have not used this command once. After making
> a
> > > > change to my bgp I just do a clear ip bgp XX sof.
> > > >
> > > >
> > > > Rich
> >
> > --
> > David Madland
> > CCIE# 2016
> > Sr. Network Engineer
> > Qwest Communications
> > 612-664-3367
> >
> > "You don't make the poor richer by making the rich poorer." --Winston
> > Churchill
-- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367"You don't make the poor richer by making the rich poorer." --Winston Churchill
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