From: Carlos (cchorao@xtra.co.nz)
Date: Fri Feb 21 2003 - 04:21:54 GMT-3
Hunt ,
Based on my experiences so far the answer to your question would be no. The
abr(r5)
does type 7 to 5 translation , not 5 to 7 i.e external routes originating
on R6 will reach R5 and R5 will pass these into the backbone, however type
5's arriving at R5 through the backbone are never into the nssa area and so
r6 should never see these routes.
Carlos
Telecom New Zealand - Advanced Solutions Group : Network Design and Security
----- Original Message -----
From: "Hunt Lee" <huntl@webcentral.com.au>
To: "'Carlos'" <cchorao@xtra.co.nz>
Cc: <ccielab@groupstudy.com>
Sent: Friday, February 21, 2003 5:59 PM
Subject: RE: IBGP redistribution mystery
> Hi Carlo,
>
> That's exactly my point... if I redistribute BGP into OSPF at R5,
shouldn't
> the BGP route get into the OSPF as LSA Type 7??
>
> Hunt
>
>
> -----Original Message-----
> From: Carlos [mailto:cchorao@xtra.co.nz]
> Sent: Friday, 21 February 2003 1:05 PM
> To: Hunt Lee
> Cc: ccielab@groupstudy.com
> Subject: Re: IBGP redistribution mystery
>
>
> Hunt,
>
> The purpose of NSSA is to enable the area to have stub capablities ( i.e
> no lsa 5's in the area) but still allowing into originate external routes
> (as type 7 lsa's). A default route must be injected at the abr if the
> routers inside the nssa need to reach type 5 lsa's destinations.
>
>
> Tx
> Carlos
> Telecom New Zealand - Advanced Solutions Group : Network Design and
Security
> ----- Original Message -----
> From: "Hunt Lee" <huntl@webcentral.com.au>
> To: "'Carlos'" <cchorao@xtra.co.nz>
> Cc: <ccielab@groupstudy.com>
> Sent: Friday, February 21, 2003 3:28 PM
> Subject: RE: IBGP redistribution mystery
>
>
> > Correctly me if I'm wrong, but I thought the whole point of NSSA is to
> allow
> > "external routes" to get in while having Stub area capability at the
same
> > time???
> >
> > Or am I completely off??
> >
> > Best Regards,
> > Hunt Lee
> >
> >
> > -----Original Message-----
> > From: Carlos [mailto:cchorao@xtra.co.nz]
> > Sent: Friday, 21 February 2003 10:02 AM
> > To: Hunt Lee; ccielab@groupstudy.com
> > Subject: Re: IBGP redistribution mystery
> >
> >
> > Hunt,
> >
> > if r5-r6 is a nssa , then no type 5 lsa enter the area. Net
200.200.200.0
> is
> > a type 5. Why should it appear on R6 ?
> >
> >
> >
> >
> > Carlos
> > Telecom New Zealand - Advanced Solutions Group : Network Design and
> Security
> > ----- Original Message -----
> > From: "Hunt Lee" <ciscoforme3@yahoo.com.au>
> > To: <ccielab@groupstudy.com>
> > Sent: Thursday, February 20, 2003 2:35 AM
> > Subject: IBGP redistribution mystery
> >
> >
> > > Hi Group,
> > >
> > > Just got a funny stuff. Remember how they said that with "bgp
> > > redistribute-internal", one can then redistribute IBGP routes into IGP
> > (like OSPF).
> > > Well... I just got a wierd one, perhaps some of you can try. Here is
> the
> > topology
> > >
> > > r4---EBGP---r3---OSPF Frame---r1---OSPF Frame---r5---NSSA---r6
> > >
> > > So now, what I did, I put a "redistribute bgp 3" at r5 under OSPF
> process,
> > but the
> > > IBGP route just doesn't want to get into the NSSA area.
> > >
> > > router ospf 1
> > > log-adjacency-changes
> > > area 4 authentication
> > > area 4 nssa default-information-originate
> > > area 4 default-cost 20
> > > redistribute bgp 3 metric 20 subnets
> > > network 10.10.1.5 0.0.0.0 area 0
> > > network 11.1.1.5 0.0.0.0 area 4
> > >
> > > router bgp 3
> > > no synchronization
> > > bgp redistribute-internal
> > > bgp log-neighbor-changes
> > > neighbor 10.10.1.1 remote-as 3
> > >
> > >
> > > Here is the routing table of r5
> > >
> > > B 200.200.200.0/24 [200/0] via 10.10.1.3, 03:33:03
> > > 137.20.0.0/24 is subnetted, 1 subnets
> > > O IA 137.20.20.0 [110/138] via 10.10.1.1, 00:00:25, Serial0
> > > 22.0.0.0/24 is subnetted, 1 subnets
> > > B 22.1.1.0 [200/0] via 10.20.1.1, 00:51:42
> > > 10.0.0.0/8 is variably subnetted, 11 subnets, 4 masks
> > > O 10.10.1.1/32 [110/64] via 10.10.1.1, 00:00:26, Serial0
> > > C 10.10.0.0/16 is directly connected, Serial0
> > > O 10.10.1.3/32 [110/128] via 10.10.1.1, 00:00:26, Serial0
> > > O IA 10.3.1.1/32 [110/129] via 10.10.1.1, 00:00:27, Serial0
> > > O IA 10.1.0.0/17 [110/65] via 10.10.1.1, 00:00:27, Serial0
> > > O IA 10.4.0.0/16 [110/202] via 10.10.1.1, 00:00:27, Serial0
> > > O IA 10.20.0.0/16 [110/128] via 10.10.1.1, 00:00:27, Serial0
> > > O IA 10.44.1.1/32 [110/193] via 10.10.1.1, 00:00:28, Serial0
> > > B 10.44.0.0/16 [200/0] via 10.10.1.3, 03:33:05
> > > O IA 10.34.0.0/16 [110/192] via 10.10.1.1, 00:00:28, Serial0
> > > O IA 10.33.1.0/25 [110/129] via 10.10.1.1, 00:00:28, Serial0
> > > 11.0.0.0/16 is subnetted, 4 subnets
> > > O N1 11.3.0.0 [110/21] via 11.1.1.6, 00:00:28, Ethernet0
> > > O N1 11.2.0.0 [110/21] via 11.1.1.6, 00:00:28, Ethernet0
> > > C 11.1.0.0 is directly connected, Ethernet0
> > > O N1 11.4.0.0 [110/21] via 11.1.1.6, 00:00:28, Ethernet0
> > > 30.0.0.0/24 is subnetted, 1 subnets
> > > B 30.1.2.0 [200/0] via 10.10.1.3, 03:33:05
> > > O*E2 0.0.0.0/0 [110/1] via 10.10.1.1, 00:00:28, Serial0
> > > R5#
> > >
> > > ANd here is the OSPF database
> > >
> > > Type-7 AS External Link States (Area 4)
> > >
> > > Link ID ADV Router Age Seq# Checksum Tag
> > > 0.0.0.0 11.1.1.5 1167 0x80000008 0x66D 0
> > > 10.44.0.0 11.1.1.5 670 0x80000002 0x336 2
> > > 11.2.0.0 11.2.1.1 910 0x80000006 0x845E 0
> > > 11.3.0.0 11.2.1.1 910 0x80000006 0x7869 0
> > > 11.4.0.0 11.2.1.1 910 0x80000006 0x6C74 0
> > > 22.1.1.0 11.1.1.5 671 0x80000002 0xDB85 0
> > > 30.1.2.0 11.1.1.5 671 0x80000002 0xED60 2
> > > 200.200.200.0 11.1.1.5 671 0x80000002 0x5BB9 2
> > >
> > > Type-5 AS External Link States
> > >
> > > Link ID ADV Router Age Seq# Checksum Tag
> > > 0.0.0.0 10.20.1.1 1052 0x80000007 0x2765 1
> > > 10.44.0.0 11.1.1.5 672 0x80000002 0xE470 2
> > > 11.2.0.0 11.1.1.5 50 0x80000001 0x13DB 0
> > > 11.3.0.0 11.1.1.5 50 0x80000001 0x7E6 0
> > > 11.4.0.0 11.1.1.5 50 0x80000001 0xFAF1 0
> > > 22.1.1.0 11.1.1.5 672 0x80000002 0x1F56 0
> > > 30.1.2.0 11.1.1.5 672 0x80000002 0xCF9A 2
> > > 200.200.200.0 11.1.1.5 672 0x80000002 0x3DF3 2
> > > R5#
> > >
> > > And for r6's OSPF database:
> > >
> > >
> > > Type-7 AS External Link States (Area 4)
> > >
> > > Link ID ADV Router Age Seq# Checksum Tag
> > > 0.0.0.0 11.1.1.5 1204 0x80000008 0x00066D 0
> > > 10.44.0.0 11.1.1.5 708 0x80000002 0x000336 2
> > > 11.2.0.0 11.2.1.1 946 0x80000006 0x00845E 0
> > > 11.3.0.0 11.2.1.1 946 0x80000006 0x007869 0
> > > 11.4.0.0 11.2.1.1 946 0x80000006 0x006C74 0
> > > 22.1.1.0 11.1.1.5 708 0x80000002 0x00DB85 0
> > > 30.1.2.0 11.1.1.5 708 0x80000002 0x00ED60 2
> > > 200.200.200.0 11.1.1.5 708 0x80000002 0x005BB9 2
> > > R6#
> > >
> > > But nothing shows up in routing table of r6
> > >
> > > R6#sh ip route 200.200.200.0
> > > % Network not in table
> > > R6#
> > >
> > >
> > > Any help / ideas would be greatly appreciated.
> > >
> > > Regards,
> > > Hunt
> > >
> > > http://mobile.yahoo.com.au - Yahoo! Mobile
> > > - Exchange IMs with Messenger friends on your Telstra or Vodafone
mobile
> > phone.
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