From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Wed Oct 23 2002 - 18:00:58 GMT-3
Sounds like old:=propietary cisco way, new:=new standard way
From the cisco learning object:
There are two versions available:
* Old-style Cisco proprietary Route Refresh. Capability Code 128 is
used to advertise it. This Route Refresh is not address-family aware.
* Standard Route Refresh described in RFC 2918. Capability Code 2 is
used to advertise it. This version supports per-address-family refresh
of routing information.
MADMAN wrote:
> 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
>>
>
-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
This archive was generated by hypermail 2.1.4 : Tue Nov 05 2002 - 08:35:54 GMT-3