In external LSAa there's no option field that's why the external route tag is used instead -this value is set automatically on the PE router during redistribution from bgp to ospf and encodes the as# of the PE's bgp process So we don't need to worry about the domain tag in single as environment
However domain tag needs to be considered when your vpn spans across multiple AS'es (or ISPS) and there's a back-door link that starts in one AS and emerges in other AS That's where the domain tag needs to be adjusted manually so that all PE routers serving sites where the back-door link starts and site where it ends share the same value to prevent form routig-loops to occure adam -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, March 15, 2010 10:25 PM To: [email protected] Subject: CCIE_SP Digest, Vol 36, Issue 9 Send CCIE_SP mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://onlinestudylist.com/mailman/listinfo/ccie_sp or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of CCIE_SP digest..." Today's Topics: 1. Type-5 LSA from CE to PE----MPLS core (venkat) 2. Re: Type-5 LSA from CE to PE----MPLS core (Marko Milivojevic) 3. Re: Type-5 LSA from CE to PE----MPLS core (venkat) 4. Down bit (venkat) ---------------------------------------------------------------------- Message: 1 Date: Tue, 16 Mar 2010 02:37:40 +0530 From: venkat <[email protected]> Subject: [OSL | CCIE_SP] Type-5 LSA from CE to PE----MPLS core To: "<[email protected]>" <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1" Hi, I am stuck with a problem. In the below topology; CE1------PE1----- MPLS---- PE2----CE2 CE1 is sending OSPF type-5 external LSA (generated by a redistributing specific loopback IP) and i could see this lsa in PE1's ospf database. But, not in BGP vpnv4 table. Is this expected behavior? I though as the tag=0,by default, E2 routes are not redistributed into BGP vpnv4. tried with changing tag value to 100 and still no success. Below is the configuration; <snip from R0-CE1> Type-5 AS External Link States Link ID ADV Router Age Seq# Checksum Tag 22.22.22.22 100.100.100.100 463 0x80000001 0x003B17 100 <From R1 - PE1> OSPF 1 VRF Type-5 AS External Link States Link ID ADV Router Age Seq# Checksum Tag 22.22.22.22 100.100.100.100 715 0x80000001 0x003B17 100 R2# ! address-family ipv4 vrf one redistribute ospf 2 vrf one no synchronization exit-address-family R2# R2#show ip bgp vpnv4 vrf one <*<< not seeing type-5 LSA* BGP table version is 50, local router ID is 2.2.2.2 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path Route Distinguisher: 1:1 (default for vrf one) *> 11.1.1.0/24 0.0.0.0 0 32768 ? *> 12.1.1.0/24 0.0.0.0 0 32768 ? *>i13.1.1.0/24 5.5.5.5 0 100 0 ? *>i13.1.2.0/24 5.5.5.5 0 100 0 ? *> 100.100.100.100/32 12.1.1.2 2 32768 ? *>i192.168.2.0 5.5.5.5 2 100 0 ? R2# Thanks, Venkat http://ippoint.wordpress.com/ -------------- next part -------------- An HTML attachment was scrubbed... URL: http://onlinestudylist.com/pipermail/ccie_sp/attachments/20100316/f3d0849c/attachment-0001.htm ------------------------------ Message: 2 Date: Mon, 15 Mar 2010 21:09:58 +0000 From: Marko Milivojevic <[email protected]> Subject: Re: [OSL | CCIE_SP] Type-5 LSA from CE to PE----MPLS core To: venkat <[email protected]> Cc: "<[email protected]>" <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset=UTF-8 Try this in BGP config for VRF one: redist ospf 2 vrf one match internal external -- Marko Milivojevic - CCIE #18427 Senior Technical Instructor - IPexpert Mailto: [email protected] Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Web: http://www.ipexpert.com/ On Mon, Mar 15, 2010 at 21:07, venkat <[email protected]> wrote: > Hi, > I am stuck with a problem. In the below topology; > CE1------PE1----- MPLS---- PE2----CE2 > CE1 is sending OSPF type-5 external LSA (generated by a redistributing > specific loopback IP) and i could see this lsa in PE1's ospf database. But, > not in BGP vpnv4 table. Is this expected behavior? I though as the tag=0,by > default, E2 routes are not redistributed into BGP vpnv4.?tried?with changing > tag value to 100 and still no success. > Below is the configuration; > <snip from R0-CE1> > ?? ? ? ? ? ? ? ?Type-5 AS External Link States > Link ID ? ? ? ? ADV Router ? ? ?Age ? ? ? ? Seq# ? ? ? Checksum Tag > 22.22.22.22 ? ? 100.100.100.100 463 ? ? ? ? 0x80000001 0x003B17 100 > <From R1 - PE1> > OSPF 1 VRF > ?? ? ? ? ? ? ? ?Type-5 AS External Link States > Link ID ? ? ? ? ADV Router ? ? ?Age ? ? ? ? Seq# ? ? ? Checksum Tag > 22.22.22.22 ? ? 100.100.100.100 715 ? ? ? ? 0x80000001 0x003B17 100 > R2# > ! > ?address-family ipv4 vrf one > ??redistribute ospf 2 vrf one > ??no synchronization > ?exit-address-family > R2# > R2#show ip bgp ?vpnv4 vrf one ?<<< not seeing type-5 LSA > BGP table version is 50, local router ID is 2.2.2.2 > Status codes: s suppressed, d damped, h history, * valid, > best, i - > internal, > ?? ? ? ? ? ? ?r RIB-failure, S Stale > Origin codes: i - IGP, e - EGP, ? - incomplete > ?? Network ? ? ? ? ?Next Hop ? ? ? ? ? ?Metric LocPrf Weight Path > Route Distinguisher: 1:1 (default for vrf one) > *> 11.1.1.0/24 ? ? ?0.0.0.0 ? ? ? ? ? ? ? ? ?0 ? ? ? ? 32768 ? > *> 12.1.1.0/24 ? ? ?0.0.0.0 ? ? ? ? ? ? ? ? ?0 ? ? ? ? 32768 ? > *>i13.1.1.0/24 ? ? ?5.5.5.5 ? ? ? ? ? ? ? ? ?0 ? ?100 ? ? ?0 ? > *>i13.1.2.0/24 ? ? ?5.5.5.5 ? ? ? ? ? ? ? ? ?0 ? ?100 ? ? ?0 ? > *> 100.100.100.100/32 > ?? ? ? ? ? ? ? ? ? ?12.1.1.2 ? ? ? ? ? ? ? ? 2 ? ? ? ? 32768 ? > *>i192.168.2.0 ? ? ?5.5.5.5 ? ? ? ? ? ? ? ? ?2 ? ?100 ? ? ?0 ? > R2# > Thanks, > Venkat > http://ippoint.wordpress.com/ > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > ------------------------------ Message: 3 Date: Tue, 16 Mar 2010 02:46:08 +0530 From: venkat <[email protected]> Subject: Re: [OSL | CCIE_SP] Type-5 LSA from CE to PE----MPLS core To: Marko Milivojevic <[email protected]> Cc: "<[email protected]>" <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1" ha. My Bad... Thanks Marko.. Forgot that only inter and intra area ospf routes are redistributed by default.. :) Now everything looks good. Regards, venkat On Tue, Mar 16, 2010 at 2:39 AM, Marko Milivojevic <[email protected]>wrote: > Try this in BGP config for VRF one: > > redist ospf 2 vrf one match internal external > > -- > Marko Milivojevic - CCIE #18427 > Senior Technical Instructor - IPexpert > > Mailto: [email protected] > Telephone: +1.810.326.1444 > Fax: +1.810.454.0130 > Web: http://www.ipexpert.com/ > > On Mon, Mar 15, 2010 at 21:07, venkat <[email protected]> wrote: > > Hi, > > I am stuck with a problem. In the below topology; > > CE1------PE1----- MPLS---- PE2----CE2 > > CE1 is sending OSPF type-5 external LSA (generated by a redistributing > > specific loopback IP) and i could see this lsa in PE1's ospf database. > But, > > not in BGP vpnv4 table. Is this expected behavior? I though as the > tag=0,by > > default, E2 routes are not redistributed into BGP vpnv4. tried with > changing > > tag value to 100 and still no success. > > Below is the configuration; > > <snip from R0-CE1> > > Type-5 AS External Link States > > Link ID ADV Router Age Seq# Checksum Tag > > 22.22.22.22 100.100.100.100 463 0x80000001 0x003B17 100 > > <From R1 - PE1> > > OSPF 1 VRF > > Type-5 AS External Link States > > Link ID ADV Router Age Seq# Checksum Tag > > 22.22.22.22 100.100.100.100 715 0x80000001 0x003B17 100 > > R2# > > ! > > address-family ipv4 vrf one > > redistribute ospf 2 vrf one > > no synchronization > > exit-address-family > > R2# > > R2#show ip bgp vpnv4 vrf one <<< not seeing type-5 LSA > > BGP table version is 50, local router ID is 2.2.2.2 > > Status codes: s suppressed, d damped, h history, * valid, > best, i - > > internal, > > r RIB-failure, S Stale > > Origin codes: i - IGP, e - EGP, ? - incomplete > > Network Next Hop Metric LocPrf Weight Path > > Route Distinguisher: 1:1 (default for vrf one) > > *> 11.1.1.0/24 0.0.0.0 0 32768 ? > > *> 12.1.1.0/24 0.0.0.0 0 32768 ? > > *>i13.1.1.0/24 5.5.5.5 0 100 0 ? > > *>i13.1.2.0/24 5.5.5.5 0 100 0 ? > > *> 100.100.100.100/32 > > 12.1.1.2 2 32768 ? > > *>i192.168.2.0 5.5.5.5 2 100 0 ? > > R2# > > Thanks, > > Venkat > > http://ippoint.wordpress.com/ > > > > _______________________________________________ > > For more information regarding industry leading CCIE Lab training, please > > visit www.ipexpert.com > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://onlinestudylist.com/pipermail/ccie_sp/attachments/20100316/876ea9d9/attachment-0001.htm ------------------------------ Message: 4 Date: Tue, 16 Mar 2010 02:54:59 +0530 From: venkat <[email protected]> Subject: [OSL | CCIE_SP] Down bit To: Marko Milivojevic <[email protected]> Cc: "<[email protected]>" <[email protected]> Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1" Yet another question. I am aware the down bit is set when the summary routes (type-3 lsa) are redistributed from PE to CE so that other PE routers will ignore the LSA. But it is not set in Type-5 LSA (not tested with type-7).. Though, http://tools.ietf.org/html/rfc4576 says "When the PE receives, from a CE router, a type 3, 5, or 7 LSA with the DN bit set, the information from that LSA MUST NOT be used during the OSPF route calculation. As a result, the LSA is not translated into a BGP route. The DN bit MUST be ignored in all other LSA types" Is there any reason why we are not using/set "DN" bit for type-5/7 as well and using "domain tag" instead? R6#show ip ospf database summary 100.100.100.100 OSPF Router with ID (6.6.6.6) (Process ID 1) Summary Net Link States (Area 0) Routing Bit Set on this LSA LS age: 39 Options: (No TOS-capability, DC, Downward) LS Type: Summary Links(Network) Link State ID: 100.100.100.100 (summary Network Number) Advertising Router: 13.1.2.1 LS Seq Number: 80000001 Checksum: 0x7A9D Length: 28 Network Mask: /32 TOS: 0 Metric: 2 R6#show ip ospf database external 22.22.22.22 OSPF Router with ID (6.6.6.6) (Process ID 1) Type-5 AS External Link States Routing Bit Set on this LSA LS age: 44 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 22.22.22.22 (External Network Number ) Advertising Router: 13.1.2.1 LS Seq Number: 80000002 Checksum: 0xAAB9 Length: 36 Network Mask: /32 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 0.0.0.0 External Route Tag: 3489660929 R6# Thanks, Venkat On Tue, Mar 16, 2010 at 2:46 AM, venkat <[email protected]> wrote: > ha. My Bad... Thanks Marko.. Forgot that only inter and intra area ospf > routes are redistributed by default.. :) > Now everything looks good. > > Regards, > venkat > > > On Tue, Mar 16, 2010 at 2:39 AM, Marko Milivojevic <[email protected]>wrote: > >> Try this in BGP config for VRF one: >> >> redist ospf 2 vrf one match internal external >> >> -- >> Marko Milivojevic - CCIE #18427 >> Senior Technical Instructor - IPexpert >> >> Mailto: [email protected] >> Telephone: +1.810.326.1444 >> Fax: +1.810.454.0130 >> Web: http://www.ipexpert.com/ >> >> On Mon, Mar 15, 2010 at 21:07, venkat <[email protected]> wrote: >> > Hi, >> > I am stuck with a problem. In the below topology; >> > CE1------PE1----- MPLS---- PE2----CE2 >> > CE1 is sending OSPF type-5 external LSA (generated by a redistributing >> > specific loopback IP) and i could see this lsa in PE1's ospf database. >> But, >> > not in BGP vpnv4 table. Is this expected behavior? I though as the >> tag=0,by >> > default, E2 routes are not redistributed into BGP vpnv4. tried with >> changing >> > tag value to 100 and still no success. >> > Below is the configuration; >> > <snip from R0-CE1> >> > Type-5 AS External Link States >> > Link ID ADV Router Age Seq# Checksum Tag >> > 22.22.22.22 100.100.100.100 463 0x80000001 0x003B17 100 >> > <From R1 - PE1> >> > OSPF 1 VRF >> > Type-5 AS External Link States >> > Link ID ADV Router Age Seq# Checksum Tag >> > 22.22.22.22 100.100.100.100 715 0x80000001 0x003B17 100 >> > R2# >> > ! >> > address-family ipv4 vrf one >> > redistribute ospf 2 vrf one >> > no synchronization >> > exit-address-family >> > R2# >> > R2#show ip bgp vpnv4 vrf one <<< not seeing type-5 LSA >> > BGP table version is 50, local router ID is 2.2.2.2 >> > Status codes: s suppressed, d damped, h history, * valid, > best, i - >> > internal, >> > r RIB-failure, S Stale >> > Origin codes: i - IGP, e - EGP, ? - incomplete >> > Network Next Hop Metric LocPrf Weight Path >> > Route Distinguisher: 1:1 (default for vrf one) >> > *> 11.1.1.0/24 0.0.0.0 0 32768 ? >> > *> 12.1.1.0/24 0.0.0.0 0 32768 ? >> > *>i13.1.1.0/24 5.5.5.5 0 100 0 ? >> > *>i13.1.2.0/24 5.5.5.5 0 100 0 ? >> > *> 100.100.100.100/32 >> > 12.1.1.2 2 32768 ? >> > *>i192.168.2.0 5.5.5.5 2 100 0 ? >> > R2# >> > Thanks, >> > Venkat >> > http://ippoint.wordpress.com/ >> > >> > _______________________________________________ >> > For more information regarding industry leading CCIE Lab training, >> please >> > visit www.ipexpert.com >> > >> > >> > > -------------- next part -------------- An HTML attachment was scrubbed... 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