From: Michel GASPARD (mgaspard@xxxxxxxxx)
Date: Wed Apr 11 2001 - 10:47:12 GMT-3
Alexandre,
This solution is also working, but:
- use a static route (remember you something???)
- takes much more commands to type
But that is clearly an alternative solution.
Thank you for your feedback.
Regards,
Michel
PS: by the way, if you use "always" in the OSPF default route
origination, you do not need a static route to 0/0.....
xander wrote:
>
> Hello All,
>
> Why don't you put default network into IGP and simply redistribute it
> to BGP? Like this:
>
> ip route 0.0.0.0 0.0.0.0 null0 (or getting default from somewhere else)
>
> router ospf 1
> default-information originate always metric 50 metric-type 1
>
> route-map DEFAULT permit 10
> match next-hop 10
> route-map DEFAULT deny 20
> match ip add 20
>
> access-list 10 permit host 192.168.1.1
> access-list 20 deny any
>
> router bgp 1
> <you do not need to put network 0.0.0.0 here>
> redistribute ospf 1 route-map DEFAULT
>
> -----------
>
> BTW, avoid using network 0.0.0.0 in any bgp configuration, or use it
> VERY CAREFULLY
>
> HL> I tried one more time using the "network 0.0.0.0" clause, the result as y
our
> HL> wish,
> HL> miraculous route entry '0.0.0.0' spread out around all router and stand
> HL> with
> HL> "show ip bgp".
>
> HL> Maybe I had made some mistake last time. thank you again.
>
> HL> Haohong Lin
>
> HL> -----Original Message-----
> HL> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> HL> Michel Gaspard
> HL> Sent: 2001 04 10 17:02
> HL> To: hhlin@szskzj.com; ccielab@groupstudy.com
> HL> Subject: RE: BGP: default route sourcing
>
> HL> Lin,
>
> HL> I just tried both solution, and they both worked well.
>
> HL> Please find additional info below.
>
> HL> Just one point: the "network 0.0.0.0" will only work if the source router
s
> HL> knows a route to 0.0.0.0/0 (static, other protocol like OSPF).
>
> HL> Regards,
>
> HL> Michel
>
> HL> R1====R2
>
> 0/0 ==>>
>
> HL> R1#
>
> HL> sh ver
> HL> Cisco Internetwork Operating System Software
> HL> IOS (tm) 2500 Software (C2500-JS-L), Version 12.0(16), RELEASE SOFTWARE
> HL> (fc2)
>
> HL> router bgp 200
> HL> network 0.0.0.0 <<<<<<<<
> HL> redistribute ospf 1 route-map redis_OS_BGP
> HL> neighbor 2.2.2.2 remote-as 100
> HL> neighbor 2.2.2.2 ebgp-multihop 255
> HL> neighbor 2.2.2.2 update-source Loopback0
> HL> no auto-summary
> HL> !
>
> HL> sh ip ro 0.0.0.0
> HL> Routing entry for 0.0.0.0/0, supernet
> HL> Known via "ospf 1", distance 110, metric 1, candidate default path
> HL> Tag 1, type extern 2, forward metric 1562
> HL> Redistributing via ospf 1, bgp 200
> HL> Last update from 159.161.10.26 on Serial0, 00:01:27 ago
> HL> Routing Descriptor Blocks:
> HL> * 159.161.10.26, from 159.161.10.5, 00:01:27 ago, via Serial0
> HL> Route metric is 1, traffic share count is 1
>
> HL> R2#
>
> HL> 3d00h: RT: add 0.0.0.0/0 via 159.161.10.4, bgp metric [20/1]
> HL> 3d00h: RT: default path is now 0.0.0.0 via 159.161.10.4
> HL> 3d00h: RT: new default network 0.0.0.0
> HL> djeser#
>
> HL> router bgp 100
> HL> bgp log-neighbor-changes
> HL> neighbor 159.161.10.4 remote-as 200
> HL> neighbor 159.161.10.4 ebgp-multihop 255
> HL> neighbor 159.161.10.4 update-source Loopback1
> HL> !
>
> HL> sh ip ro 0.0.0.0
> HL> Routing entry for 0.0.0.0/0, supernet
> HL> Known via "bgp 100", distance 20, metric 1, candidate default path
> HL> Tag 200, type external
> HL> Last update from 159.161.10.4 00:03:02 ago
> HL> Routing Descriptor Blocks:
> HL> * 159.161.10.4, from 159.161.10.4, 00:03:02 ago
> HL> Route metric is 1, traffic share count is 1
> HL> AS Hops 1
>
> >> From hhlin@szskzj.com Tue Apr 10 10:12:56 2001
> >> From: "Haohong Lin" <hhlin@szskzj.com>
> >> To: "Michel Gaspard" <mgaspard@cisco.com>
> >> Cc: "CCIELab" <ccielab@groupstudy.com>
> >> Subject: RE: CCBootCamp Question - Lab2 Section3 Task1
> >> Date: Tue, 10 Apr 2001 15:45:15 +0800
> >> Importance: Normal
> >>
> >> Hi, Gaspard,
> >>
> >> I followed your advice and implement both of method as cisco cd
> HL> suggestion.
> >> the clause "default-infor org" work fine, but "net 0.0.0.0" had no
> HL> function.
> >> Why?
> >>
> >>
> >> regards,
> >>
> >> Haohong Lin
> >>
> >> -----Original Message-----
> >> From: Michel Gaspard [mailto:mgaspard@cisco.com]
> >> Sent: 2001 04 09 23:32
> >> To: ccielab@groupstudy.com; hhlin@szskzj.com
> >> Subject: Re: CCBootCamp Question - Lab2 Section3 Task1
> >>
> >>
> >> Lin,
> >>
> >>
> >> Look in:
> >>
> >>
> HL> http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/np
1_r
> >> /1rprt1/1rbgp.htm#xtocid1108620
> >>
> >> "
> >> To allow the redistribution of network 0.0.0.0 into BGP, use the
> >> default-information originate router configuration command. To disable
> HL> this
> >> function, use the no form of this command.
> >>
> >> The same functionality will result from the network 0.0.0.0 command, using
> >> the network router configuration command. <<<<<< mmmmmh, that stinks like
> HL> a
> >> CCIE question!! No NDA, just a wild guess......
> >>
> >> "
> >>
> >> I did the same setup, and until I entered that command nix. Then it come
> HL> up
> >> nicely.
> >>
> >> So I understand that BGP will only advertise a defualt route:
> >> - if it knows about one
> >> - default-information originate" is present
> >>
> >>
> >>
> >> > From nobody@groupstudy.com Mon Apr 9 03:52:34 2001
> >> > From: "Haohong Lin" <hhlin@szskzj.com>
> >> > To: "CCIELab" <ccielab@groupstudy.com>
> >> > Subject: CCBootCamp Question - Lab2 Section3 Task1
> >> > Date: Mon, 9 Apr 2001 09:39:20 +0800
> >> > Sender: nobody@groupstudy.com
> >> > Reply-To: "Haohong Lin" <hhlin@szskzj.com>
> >> >
> >> > Hi,
> >> >
> >> > When I redistribtue OSPF to BGP 3 having no route-map, I have
> >> > no route entry of "0.0.0.0". In BootCamp's answer pages, there is
> >> > route-map to filter the route '0.0.0.0', Is that necessary?
> >> >
> >> > This is the redistribution expression I used:
> >> > router bgp 3
> >> > redistribute ospf 20 metric 10 match internal external 1 external 2
> >> >
> >> > R6#sh ip ospf da
> >> >
> >> > OSPF Router with ID (12.2.1.1) (Process ID 20)
> >> >
> >> >
> >> > Router Link States (Area 0)
> >> >
> >> > Link ID ADV Router Age Seq# Checksum Link
> HL> count
> >> > 12.2.1.1 12.2.1.1 1598 0x80000002 0xD25A 2
> >> > 172.168.32.1 172.168.32.1 14 (DNA) 0x80000002 0x7F05 4
> >> >
> >> > Type-5 AS External Link States
> >> >
> >> > Link ID ADV Router Age Seq# Checksum Tag
> >> > 0.0.0.0 12.2.1.1 1689 0x80000001 0xC7B4 20
> >> > ^^^^^^^there is a 0.0.0.0 route entry^^^^^^^^^^^^^
> >> > 77.1.1.0 172.168.32.1 54 (DNA) 0x80000001 0x41A3 0
> >> > R6#
> >> > R6#sh ip bgp
> >> > BGP table version is 13, local router ID is 12.2.1.1
> >> > Status codes: s suppressed, d damped, h history, * valid, > best, i -
> >> > internal
> >> > Origin codes: i - IGP, e - EGP, ? - incomplete
> >> >
> >> > Network Next Hop Metric LocPrf Weight Path
> >> > *> 12.2.0.0/16 0.0.0.0 10 32768 ?
> >> > *> 12.3.0.0/16 12.2.1.2 10 32768 ?
> >> > *> 12.4.0.0/16 12.2.1.2 10 32768 ?
> >> > *> 41.1.1.0/24 11.1.1.5 300 0 2 1 ?
> >> > *> 44.1.1.0/24 11.1.1.5 300 0 2 1 i
> >> > *> 77.1.1.0/24 12.2.1.2 10 32768 ?
> >> > R6#
> --
> WBW, xander
> mailto:xander@adt.ru
> CCNA, CCNP+VoiceAccess, CCIE very soon :-)
>
> ...
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