Yes. Sure,
Its
Thanks,
-Nats-
From:
mc36 <>
Date: Tuesday, February 28, 2023 at 2:58 PM
To: Natrajan Venkataraman <>, <>, Krzysztof Szarkowicz <>, Kaliraj Vairavakkalai <>, Anton Elita <>
Cc: Reshma Das <>
Subject: Re: [rare-dev] BGP CT interop - Colorful Resolution
[External Email. Be cautious of content]
hi natrajan,
btw i just realized that it was you who hacked who provided the code?
would you mind joining the team @ github? if yess, please give us your
github handle and frederic will invite you too to be able to contribute
directly! :)
thanks,
cs
On 2/28/23 23:13, mc36 wrote:
> hi,
>
> you're crazy good! i never ever thought that you really will contribute code fixes to freerouter... :)
>
> so yesss the missing addUpdatedTable() calls yeahh.... i just realized that a lot more were missing there,
> this was my first idea:
>
https://urldefense.com/v3/__https://github.com/rare-freertr/freeRtr/commit/509a5ada3ee69c47227583a06ca23f1709181de3__;!!NEt6yMaO-gk!GFj6D2gei3RHnHIHNnTMM3v4iAvIr4RH1zRe5I0ivIHBY_QTxa0hztpVKLXfamnsFGKXOA$
>
> here the labelled and the ipv6-labelled-over-v4 and ipv6-ctp-over-v4 were also missing...
> but then i checked the tabRoute.addUpdatedTable code that it does not have any clue if
> the afi is even active so it would add the same prefix multiple times so instead i came
> up with this:
>
https://urldefense.com/v3/__https://github.com/rare-freertr/freeRtr/commit/1aeb9410d51eb530450859107e2834ffce63d106__;!!NEt6yMaO-gk!GFj6D2gei3RHnHIHNnTMM3v4iAvIr4RH1zRe5I0ivIHBY_QTxa0hztpVKLXfamnfDDsuJg$
>
> basically the main idea is that i check if the afi is active and call the addUpdatedTable()
> only if the proper afi was negotiated, so each prefix will be added only once... could you
> please check if this still works for you? (just asking because this part of the code only
> reachable if you configured soft-reconfig-inbound which is somewhat uncommon after the
> widespread of route-refresh message...)
>
>
>
> regarding the bgp invalid update, and your side complained about the malformed header, then
> i quickly decoded and it's a 15936 bytes update whereas bgp allows only 4096 soo you're right... :)
> well, it's a huge dump and what we're staring at is a result of a series of other events that
> resulted in this invalid update message... it's hard to reconstruct just from this so can i ask
> you as you already can reproduce it, do the following to the freerouter:
>
> router bgp4 1
> dump mrt ./bgp4.mrt
> neighbor all.you.have.here dump mrt
>
> and let it run for a hour to collect enough updates and series of events to be able to see what could be the cause?
>
> then i can do a lot more with this:
> "packet mrt2pcap aaa.mrt zzz.pcap" or even more fun: "packet mrt2bgp will replay ..."
> in the lab then hopefully your stream wull hit the same invalid update as a result... :)
>
>
> ps:
> while the ci-cd runs against the second commit, i was thinking and i have the idea that
> the latest-greatest (with the check for the double addition to the table) will solve the
> huuge update problem, but let's see.... :)
>
> thanks,
> cs
>
>
>
> On 2/28/23 22:02, Natrajan Venkataraman wrote:
>> Hi Csaba/All,
>>
>> There is some exciting news to share.
>>
>> FreeRTR transits traffic colorfully!
>>
>> The configs/code-change/bug-report can be found in the attachments.
>>
>> Topology:
>>
>> CE1 (10.1.1.1)
>>
>> |
>>
>> [PE11----P1----ASBR11] AS1: JUNOS
>>
>> |
>>
>> |
>>
>> AS2: FREERTR [ASBR21----P2----ASBR22]
>>
>> |
>>
>> |
>>
>> AS3: JUNOS [ASBR31----P3----PE31]
>>
>> |
>>
>> (10.11.11.11) CE2
>>
>> AS1, AS3: PE/ASBR have RSVP Gold and Bronze tunnels towards each other.
>>
>> Free Router Deployment and Config:
>>
>> ASBR11
>>
>> |EBGP-CT
>>
>> |
>>
>> | IBGP-CT IBGP-CT V1:ISIS,LDP
>>
>> ASBR21---------P2(RR)---------ASBR22
>>
>> V1:ISIS1,LDP V1:ISIS,LDP |
>>
>> V2:ISIS2,LDP |EBGP-CT
>>
>> V3:ISIS3,LDP ASBR31
>>
>> ASBR21:
>>
>> CT routes learned from ASBR22 will resolve based on the following
>>
>> route-policy to VRF V2 and V3 based on color via
>>
>> LDP with ISIS2 and ISIS3 respectively
>>
>> CT routes will be advertised from V2 and V3 post resolution.
>>
>> vrf definition v2
>>
>> rd 68106:168427528
>>
>> clr4import 100
>>
>> clr4export 100
>>
>> clr6import 100
>>
>> clr6export 100
>>
>> label4mode per-prefix
>>
>> label6mode per-prefix
>>
>> exit
>>
>> !
>>
>> vrf definition v3
>>
>> rd 68106:168427529
>>
>> clr4import 200
>>
>> clr4export 200
>>
>> clr6import 200
>>
>> clr6export 200
>>
>> label4mode per-prefix
>>
>> label6mode per-prefix
>>
>> exit
>>
>> !
>>
>> route-policy ibgp-in
>>
>> sequence 10 if extcomm 2562:0:100
>>
>> sequence 20 set vrf v2 ipv4
>>
>> sequence 30 pass
>>
>> sequence 40 enif
>>
>> sequence 50 if extcomm 2562:0:200
>>
>> sequence 60 set vrf v3 ipv4
>>
>> sequence 70 pass
>>
>> sequence 80 enif
>>
>> sequence 90 drop
>>
>> exit
>>
>> router bgp4 1
>>
>> vrf v1
>>
>> local-as 64512
>>
>> router-id 10.21.21.21
>>
>> no safe-ebgp
>>
>> address-family unicast
>>
>> nexthop recursion 3
>>
>> !
>>
>> neighbor 10.11.121.1 remote-as 64511
>>
>> neighbor 10.11.121.1 local-as 64512
>>
>> neighbor 10.11.121.1 address-family ctp
>>
>> neighbor 10.11.121.1 distance 20
>>
>> neighbor 10.11.121.1 send-community standard extended
>>
>> !
>>
>> neighbor 10.20.20.20 remote-as 64512
>>
>> neighbor 10.20.20.20 local-as 64512
>>
>> neighbor 10.20.20.20 address-family ctp
>>
>> neighbor 10.20.20.20 distance 200
>>
>> neighbor 10.20.20.20 update-source loopback0
>>
>> neighbor 10.20.20.20 traffeng
>>
>> neighbor 10.20.20.20 send-community standard extended
>>
>> neighbor 10.20.20.20 route-policy-in ibgp-in
>>
>> !
>>
>> afi-clr v2 enable
>>
>> afi-clr v2 redistribute bgp4 1
>>
>> !
>>
>> afi-clr v3 enable
>>
>> afi-clr v3 redistribute bgp4 1
>>
>> !
>>
>> freertr-asbr21(cfg)#show ipv4 route v1
>>
>> typ prefix metric iface hop time
>>
>> B 10.10.10.10/32 68106:168427528 200/0 ethernet3@v2:4<< 10.21.12.1 00:09:43
>>
>> B 10.10.10.10/32 68106:168427529 200/0 ethernet3@v3:4<< 10.21.12.1 00:09:43
>>
>> NOTE: This needed code modification in FreeRtR to have the route-policy-in apply for CTP family.
>>
>> The code diff is attached.
>>
>> freertr-asbr21#show mpls forwarding
>>
>> label vrf iface hop label targets bytes
>>
>> 702088 v2:4 ethernet4 10.21.22.1 727749(LDP-PUSH),235868(CT-SWAP) 0
>>
>> 942958 v3:4 ethernet5 10.21.32.1 727749(LDP-PUSH),700462(CT-SWAP) 865368
>>
>> ASBR22:
>>
>> CT routes learned from ASBR21 will resolve via best effort
>>
>> LDP in V1 (Same as previous BGP-CT InterOp Demo)
>>
>> BUGS:
>>
>> @ASBR-21: ASBR11-ASBR21 EBGP session flap due to Bad Packet
>>
>> from FreeRTR to JUNOS.
>>
>> This issue does not arise when the config is initially loaded
>>
>> but about 5 minutes since the EBGP session towards ASBR11
>>
>> comes up. The initial CT advertisements go correctly with
>>
>> right encoding and packet length and ASBR11 accepts and
>>
>> forms the End-to-End Path. Ping succeeded on End to End Path.
>>
>> However, ASBR11 after ~5 mins, gets malformed update from
>>
>> FreeRTR and terminates the session. This needs to be fixed.
>>
>> I have attached the malformed packet and full-configs.
>>
>> Thanks,
>>
>> -Nats-
>>
>> *From: *mc36 <>
>> *Date: *Tuesday, February 28, 2023 at 11:29 AM
>> *To: * <>, Krzysztof Szarkowicz <>, Kaliraj Vairavakkalai <>, Natrajan Venkataraman
>> <>, Anton Elita <>
>> *Cc: *Reshma Das <>
>> *Subject: *Re: [rare-dev] BGP CT interop - Colorful Resolution
>>
>> [External Email. Be cautious of content]
>>
>>
>> it took more than expected sorry....
>>
>> please find attached the topology what i now pretty sure will work with the 2 ebgp vpnv4 and 1 bgp-ct for the colors...
>>
>> at this time i used more descriptive vrf names like core, blue (a color of the core) red (same) and cust[1,2]
>>
>> the cpes (r1, r2, r6, r7) are dump default route, the r3 is a single pe, have a ebgp-bgp-ct and 2 ebgp-vpnv4,
>> whereas r4 have just ebgp-bgp-ct, plus isis toward r5... r5 have ibgp-bgp-ct to r4, plus ebgp-vpnv4 to r3...
>>
>> when i initiate some ping flood, i see different counters in "display mpls forwarding" in r4 so they're separated...
>>
>> r1#ping 3.3.3.5 vrf cust1 size 1111 repeat 11111111
>> r2#ping 4.4.4.5 vrf cust2 size 1111 repeat 11111111
>>
>> now i have some smaller stuff but soon i'll study if i can add the "afi-vrf cust1 resolve-in blue" easily or not :)))
>>
>> thanks,
>> cs
>>
>>
>>
>> On 2/28/23 11:16, Krzysztof Szarkowicz wrote:
>>> +Anton
>>>
>>> --
>>>
>>> Krzysztof Grzegorz Szarkowicz, JAWS PLM, Solutions Architect | Phone: +49 89 203 012 127
>>>
>>> Please consider my current time zone, when calling: CET (UTC+01:00)
>>>
>>> https://easylink.juniper.net/slicing <https://easylink.juniper.net/slicing>
>>>
>>> *From: *mc36 <>
>>> *Date: *Tuesday, 2023-02-28:Tu at 11:09
>>> *To: *Kaliraj Vairavakkalai <>, Natrajan Venkataraman <>
>>> *Cc: *Reshma Das <>, <>, Krzysztof Szarkowicz <>
>>> *Subject: *Re: [rare-dev] BGP CT interop - Colorful Resolution
>>>
>>> [External Email. Be cautious of content]
>>>
>>>
>>> hi,
>>>
>>> after a quick look at the vrf import routine, this is where the nexthop's table is set:
>>>
https://urldefense.com/v3/__https://github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/rtr/rtrBgpVrfRtr.java*L300__;Iw!!NEt6yMaO-gk!Hlv7SV6fqBveGXhRqzVJ0LNnqBQztmRhbiz326LViyZKETqIWnRNylAXw0tkX6-h2IHVbMIvNA46$ <https://urldefense.com/v3/__https:/github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/rtr/rtrBgpVrfRtr.java*L300__;Iw!!NEt6yMaO-gk!Hlv7SV6fqBveGXhRqzVJ0LNnqBQztmRhbiz326LViyZKETqIWnRNylAXw0tkX6-h2IHVbMIvNA46$>
<https://urldefense.com/v3/__https:/github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/rtr/rtrBgpVrfRtr.java*L300__;Iw!!NEt6yMaO-gk!Hlv7SV6fqBveGXhRqzVJ0LNnqBQztmRhbiz326LViyZKETqIWnRNylAXw0tkX6-h2IHVbMIvNA46$ <https://urldefense.com/v3/__https:/github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/rtr/rtrBgpVrfRtr.java*L300__;Iw!!NEt6yMaO-gk!Hlv7SV6fqBveGXhRqzVJ0LNnqBQztmRhbiz326LViyZKETqIWnRNylAXw0tkX6-h2IHVbMIvNA46$>>
>>>
>>> maybe a new variable int that class like (afi-vrf blue) "underlays <vrf1> [vrf2]...[vrfn]" will do the trick permanently...
>>>
>>>
https://urldefense.com/v3/__https://github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/rtr/rtrBgp.java*L2690__;Iw!!NEt6yMaO-gk!Hlv7SV6fqBveGXhRqzVJ0LNnqBQztmRhbiz326LViyZKETqIWnRNylAXw0tkX6-h2IHVbHBkgr18$ <https://urldefense.com/v3/__https:/github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/rtr/rtrBgp.java*L2690__;Iw!!NEt6yMaO-gk!Hlv7SV6fqBveGXhRqzVJ0LNnqBQztmRhbiz326LViyZKETqIWnRNylAXw0tkX6-h2IHVbHBkgr18$>
<https://urldefense.com/v3/__https:/github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/rtr/rtrBgp.java*L2690__;Iw!!NEt6yMaO-gk!Hlv7SV6fqBveGXhRqzVJ0LNnqBQztmRhbiz326LViyZKETqIWnRNylAXw0tkX6-h2IHVbHBkgr18$ <https://urldefense.com/v3/__https:/github.com/rare-freertr/freeRtr/blob/master/src/net/freertr/rtr/rtrBgp.java*L2690__;Iw!!NEt6yMaO-gk!Hlv7SV6fqBveGXhRqzVJ0LNnqBQztmRhbiz326LViyZKETqIWnRNylAXw0tkX6-h2IHVbHBkgr18$>>
>>>
>>> i'll experiment with that after i brought up the currently planned eantc topology.... :)
>>>
>>> br,
>>> cs
>>>
>>>
>>>
>>> On 2/28/23 10:31, mc36 wrote:
>>> > hi,
>>> >
>>> > i did some real quick tests and this is really just what i said initially,
>>> >
>>> > so the original bgp behavior with the next-hop-unchanged toward route reflectors...
>>> >
>>> > now i'll play a bit with my original idea about the two ebgp between pe1 and pe2 in the eantc topology...
>>> >
>>> > that one is im pretty sure will work for the interop event, and as we'll be onsite, after we configured up everything real quick,
>>> >
>>> > we could hack together on something that lifts this 2 ebgp requirement in freerouter... :)
>>> >
>>> > thanks,
>>> >
>>> > cs
>>> >
>>> >
>>> > On 2/27/23 22:37, Kaliraj Vairavakkalai wrote:
>>> >> Those are kind words Csaba . I m glad we are in the right direction.
>>> >>
>>> >>> i'll try that asap !
>>> >>
>>> >> Cool!. Will wait for your experiment. Fingers crossed.
>>> >>
>>> >> Thanks
>>> >>
>>> >> Kaliraj
>>> >>
>>> >> *From: *mc36 <>
>>> >> *Date: *Monday, February 27, 2023 at 11:37 AM
>>> >> *To: *Kaliraj Vairavakkalai <>, Natrajan Venkataraman <>
>>> >> *Cc: *Reshma Das <>, <>, Krzysztof Szarkowicz <>
>>> >> *Subject: *Re: BGP CT interop - Colorful Resolution
>>> >>
>>> >> [External Email. Be cautious of content]
>>> >>
>>> >>
>>> >> + krzysztof && rare-dev as it's a core rare-dev question, thanks you!!!
>>> >>
>>> >> hi,
>>> >>
>>> >> you're crazy good, seemingly you know my shit better than me.... :)))))))
>>> >>
>>> >> so that nexthop recursive was added when i given support for the original bgp behavior of nexthop processing:
>>> >>
>>> >> that is, when you no-next-hop-self toward the route reflectors on your peering node...
>>> >>
>>> >> freerouter by default assumes next-hop-self without that knob configured...
>>> >>
>>> >> but you're right, basically that recursive knob could be reused for the bgp-ct then i wont need two ebgp at eantc tests....
>>> >>
>>> >> i'll try that asap !
>>> >>
>>> >> ps: i <3 your private build XDDD
>>> >>
>>> >> thanks,
>>> >> cs
>>> >>
>>> >>
>>> >>
>>> >>
>>> >>
>>> >> On 2/27/23 19:56, Kaliraj Vairavakkalai wrote:
>>> >>> Also, Csaba
>>> >>>
>>> >>> Just some random observations:
>>> >>>
>>> >>> This config looks interesting:
>>> >>>
>>> >>>
>>> >>>
>>> >>> r4(cfg-rtr)#neighbor 2.2.2.3 address-family vpnuni
>>> >>> r4(cfg-rtr)#ne?
>>> >>>
>>> neighbor
>>> - specify neighbor parameters
>>> >>> *
>>> nexthop
- specify next hop tracking parameter*
>>> >>>
>>> >>> r4(cfg-rtr)#nexthop ?
>>> >>> prefix-list - filter next hops
>>> >>> *recursion - specify recursion depth*
>>> >>> route-map - filter next hops
>>> >>> route-policy - filter next hops
>>> >>>
>>> >>> r4(cfg-rtr)#nexthop recursion ?
>>> >>> <num> - maximum rounds
>>> >>>
>>> >>> r4(cfg-rtr)#nexthop recursion 4
>>> >>>
>>> >>> and, from the code, this function arguments:
>>> >>>
>>> >>> /**
>>> >>>
>>> >>> * fix nexthops on a route entry
>>> >>>
>>> >>> *
>>> >>>
>>> >>> * @param <T> class of address
>>> >>>
>>> >>> * @param imp route entry to update
>>> >>>
>>> >>> * * @param recurs where to look up nexthops recursively*
>>> >>>
>>> >>> * * @param nexthops table where look up resolved nexthops*
>>> >>>
>>> >>> * @param recurn maximum recursion depth
>>> >>>
>>> >>> * @return true if failed, false if ready
>>> >>>
>>> >>> */
>>> >>>
>>> >>> public static <T extends addrType> boolean doNexthopFix(tabRouteEntry<T> imp, tabRoute<T> recurs, tabRoute<T>
>>> nexthops, int recurn) {
>>> >>>
>>> >>> (in tabRoute.java)
>>> >>>
>>> >>> if we pass in the color vrf table v2 as recurs argument, will that result in doing bgp nexthop resolution based on entries
>>> in that v2 table only?
>>> >>>
>>> >>> Basically,
>>> >>>
>>> >>> * from CLI, configure a community -> color-vrf/table mapping.
>>> >>> * When route is received, based on community, pick the color-table, and pass it as recurs in the above function.
>>> >>> * That should result in resolving bgp nexthop over rsvp/ldp routes in that color-table?
>>> >>>
>>> >>> Then we wouldn t need the import policy to match on RD and set vrf nexthop. And this method may work for all bgp families.
>>> >>>
>>> >>> I have a dev setup with freeRtr code ready, where I wanted to experiment doing the above. Just wanted to update you.
>>> >>>
>>> >>> You can tell if I am understanding the code right, or if I am going in wrong direction. Also, if you agree with the concept,
>>> >>>
>>> >>> You will be able to code it faster.
>>> >>>
>>> >>> bash-3.2$ dk rtr0
>>> >>>
>>> >>> root@edc770cfeb8a:/opt/freertr# telnet localhost 2323
>>> >>>
>>> >>> Trying 127.0.0.1...
>>> >>>
>>> >>> Connected to localhost.
>>> >>>
>>> >>> Escape character is '^]'.
>>> >>>
>>> >>> welcome
>>> >>>
>>> >>> line ready
>>> >>>
>>> >>> freertr#show ver
>>> >>>
>>> >>> freeRouter v23.2.25-cur, done by cs@nop.
>>> >>>
>>> >>> *private build - kaliraj -*****
>>> >>>
>>> >>> place on the web:
https://urldefense.com/v3/__http://www.freertr.org/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_NBOxPhg$
>> <https://urldefense.com/v3/__http:/www.freertr.org/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_NBOxPhg$>
>>> <https://urldefense.com/v3/__http:/www.freertr.org/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_NBOxPhg$
>> <https://urldefense.com/v3/__http:/www.freertr.org/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_NBOxPhg$>>
>>> >> <https://urldefense.com/v3/__http:/www.freertr.org/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_NBOxPhg$
>>> <https://urldefense.com/v3/__http:/www.freertr.org/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_NBOxPhg$
>> <https://urldefense.com/v3/__http:/www.freertr.org/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_NBOxPhg$>>>
>>> >>>
>>> >>> license:
https://urldefense.com/v3/__http://creativecommons.org/licenses/by-sa/4.0/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_M31zlre$
>> <https://urldefense.com/v3/__http:/creativecommons.org/licenses/by-sa/4.0/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_M31zlre$>
>>> <https://urldefense.com/v3/__http:/creativecommons.org/licenses/by-sa/4.0/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_M31zlre$
>> <https://urldefense.com/v3/__http:/creativecommons.org/licenses/by-sa/4.0/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_M31zlre$>>
>>> >> <https://urldefense.com/v3/__http:/creativecommons.org/licenses/by-sa/4.0/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_M31zlre$
>>> <https://urldefense.com/v3/__http:/creativecommons.org/licenses/by-sa/4.0/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_M31zlre$
>> <https://urldefense.com/v3/__http:/creativecommons.org/licenses/by-sa/4.0/__;!!NEt6yMaO-gk!H3SnIGYzFbrhxrhXtZ2diMvam2kBs7WeQgDvTqgTCewafLQi7u86cFptGheS5qQy_M31zlre$>>>
>>> >>>
>>> >>> quote1: make the world better
>>> >>>
>>> >>> I just got started, able to modify the version string and see the result.
>>> >>>
>>> >>> Thanks
>>> >>>
>>> >>> Kaliraj
>>> >>>
>>> >>> *From: *Natrajan Venkataraman <>
>>> >>> *Date: *Saturday, February 25, 2023 at 11:52 AM
>>> >>> *To: *mc36 <>
>>> >>> *Cc: *Kaliraj Vairavakkalai <>, Reshma Das <>
>>> >>> *Subject: *BGP CT interop - Colorful Resolution
>>> >>>
>>> >>> Hi Csaba,
>>> >>>
>>> >>> We tried experimenting the new free-rtr code for colorful resolution with the configuration that you had shared. However we are hitting a few roadblocks that needs to be
>>> addressed
>>> >>> in free-rtr code.
>>> >>>
>>> >>> The topology is as same as the demo that was performed in IETF 115 where resolution was happening via LDP best effort for BGP CT route in ASBR21 received from ASBR22
>>> (10.22.22.22).
>>> >>> However, we modified the demo based on the configs shared by you for colorful resolution.
>>> >>>
>>> >>> We have attached the Old and New configs for your reference for ASBR21. Rest of the configs (P2, ASR22) are more or less the same. You can refer to the topology from the demo
>>> >>> video.
>>> >>>
>>> >>> Thanks,
>>> >>>
>>> >>> -Nats-
>>> >>>
>>> >>> DETAILS:
>>> >>>
>>> >>> ````````````
>>> >>>
>>> >>> THIS IS THE NON-WORKING CASE WITH RSVP:
>>> >>>
>>> >>> =======================================
>>> >>>
>>> >>> The following is the summary list of what we are trying to achieve
>>> >>>
>>> >>> @ ASBR 21,
>>> >>>
>>> >>> - Configure VRF V2 and V3 to import based on BGP-CT RD/RT
>>> >>>
>>> >>> freertr-asbr21#show running-config vrf v2
>>> >>>
>>> >>> vrf definition v2
>>> >>>
>>> >>> rd 68106:168427528
>>> >>>
>>> >>> rt4import 68106:168427528
>>> >>>
>>> >>> rt6import 68106:168427528
>>> >>>
>>> >>> exit
>>> >>>
>>> >>> freertr-asbr21#show running-config vrf v3
>>> >>>
>>> >>> vrf definition v3
>>> >>>
>>> >>> rd 68106:168427529
>>> >>>
>>> >>> rt4import 68106:168427529
>>> >>>
>>> >>> rt6import 68106:168427529
>>> >>>
>>> >>> exit
>>> >>>
>>> >>> - We created RSVP tunnels tunnel1 and tunnel2 in VRF v2 and v3 respectively (However we keep tunnel VRF same as forwarding VRF)
>>> >>>
>>> >>> freertr-asbr21#show running-config interface tunnel1
>>> >>>
>>> >>> interface tunnel1
>>> >>>
>>> >>> description lsp_asbr21_asbr22
>>> >>>
>>> >>> tunnel vrf v2
>>> >>>
>>> >>> tunnel source loopback2
>>> >>>
>>> >>> tunnel destination 10.22.22.22
>>> >>>
>>> >>> tunnel mode p2pte
>>> >>>
>>> >>> vrf forwarding v2
>>> >>>
>>> >>> ipv4 address 10.121.121.121 255.255.255.0
>>> >>>
>>> >>> mpls enable
>>> >>>
>>> >>> no shutdown
>>> >>>
>>> >>> no log-link-change
>>> >>>
>>> >>> exit
>>> >>>
>>> >>> freertr-asbr21#show running-config interface tunnel2
>>> >>>
>>> >>> interface tunnel2
>>> >>>
>>> >>> description lsp_asbr21_asbr22
>>> >>>
>>> >>> tunnel vrf v3
>>> >>>
>>> >>> tunnel source loopback3
>>> >>>
>>> >>> tunnel destination 10.22.22.22
>>> >>>
>>> >>> tunnel mode p2pte
>>> >>>
>>> >>> vrf forwarding v3
>>> >>>
>>> >>> ipv4 address 10.221.221.221 255.255.255.0
>>> >>>
>>> >>> mpls enable
>>> >>>
>>> >>> no shutdown
>>> >>>
>>> >>> no log-link-change
>>> >>>
>>> >>> exit
>>> >>>
>>> >>> !
>>> >>>
>>> >>> freertr-asbr21#show ipv4 rsvp v2 summary
>>> >>>
>>> >>> source id
>>> >>> subgroup id target
>>> id
description
>>> >>>
>>> >>> 10.121.21.21 8906
>>> >>> :: 0
>>> 10.22.22.22 902663016 freertr-asbr21:tunnel1
>>> >>>
>>> >>> freertr-asbr21#show ipv4 rsvp v3 summary
>>> >>>
>>> >>> source
>>> >>> id subgroup id target
>>> id
description
>>> >>>
>>> >>> 10.221.21.21 12715
>>> >>> :: 0
>>> 10.22.22.22 793731422 freertr-asbr21:tunnel2
>>> >>>
>>> >>> - Then we added static routes for 10.22.22.22 in V2 and V3 to point to tunnel1 and tunnel2.
>>> >>>
>>> >>> (This we assume, prevents the need for rewriting the nexthop in policy ibpg-in)
>>> >>>
>>>
>>> >>>
freertr-asbr21#show ipv4 route v2
>>> >>>
>>>
>>> >>>
typ
>>> prefix
metric iface
>>> >>>
>>> hop
time
>>> >>>
>>>
>>> >>>
S
>>> 10.22.22.22/32 1/0
tunnel1
>>> 10.121.121.122 02:19:56
>>> >>>
>>>
>>> >>>
freertr-asbr21#show ipv4 route v3
>>> >>>
>>>
>>> >>>
typ
>>> prefix
metric iface
>>> >>>
>>> hop
time
>>> >>>
>>>
>>> >>>
S
>>> 10.22.22.22/32 1/0
tunnel2
>>> 10.221.221.222 02:20:18
>>> >>>
>>> >>> - Then we added policy ibgp-in to filter BGP CT routes to resolve on VRFs V2 and V3 based on RD
>>> >>>
>>> >>> (However we found that the following policy is not applying on the BGP CT routes, therefore BGP CT routes do not have a way to set their
>>> respective resolving
>>> VRFs V2 and
>>> >>> V3)
>>> >>>
>>> >>> freertr-asbr21(cfg)#show running-config route-policy ibgp-in
>>> >>>
>>> >>> route-policy ibgp-in
>>> >>>
>>> >>> sequence 10 if rd 68106:168427528
>>> >>>
>>> >>> sequence 20 set vrf v2 ipv4
>>> >>>
>>> >>> sequence 30 pass
>>> >>>
>>> >>> sequence 40 enif
>>> >>>
>>> >>> sequence 50 if rd 68106:168427529
>>> >>>
>>> >>> sequence 60 set vrf v3 ipv4
>>> >>>
>>> >>> sequence 70 pass
>>> >>>
>>> >>> sequence 80 enif
>>> >>>
>>> >>> sequence 90 drop
>>> >>>
>>> >>> exit
>>> >>>
>>> >>> !
>>> >>>
>>>
>>> >>>
router bgp4 1
>>> >>>
>>> >>> neighbor 10.20.20.20 route-policy-in ibgp-in
>>> >>>
>>> >>> neighbor 10.20.20.20 vpn-route-policy-in ibgp-in <<<
>>> >>>
>>> >>> What we are looking for is an installation of SWAP + PUSH for BGP-CT (SWAP) over RSVP (PUSH) similar to the working scenario (Option B) instead of what is being tried
>>> above which
>>> >>> we assume is (Option A + B). The following section depicts the working case and expected behavior.
>>> >>>
>>> >>> THIS IS THE WORKING CASE WITH LDP:
>>> >>>
>>> >>> ==================================
>>> >>>
>>> >>> freertr-asbr21#show ipv4 bgp 1 ctp database
>>> >>>
>>> >>>
>>> prefix
hop metric
>>> >>> aspath
>>> >>>
>>> >>> 10.2.2.2/32 68098:33685512 10.11.121.1
>>> 20/100/0/0 64511
>>> >>>
>>> >>> 10.2.2.2/32 68098:33685513 10.11.121.1
>>> 20/100/0/0 64511
>>> >>>
>>> >>> 10.10.10.10/32 68106:168427528 10.22.22.22 200/100/0/0 64513
>>> >>>
>>> >>> 10.10.10.10/32 68106:168427529 10.22.22.22 200/100/0/0 64513 <<<<<
>>> >>>
>>> >>> freertr-asbr21#show ipv4 bgp 1 ctp database 10.10.10.10/32 68106:168427529
>>> >>>
>>> >>> id
>>> category
value
>>> >>>
>>> >>>
>>> vrf
v1:4
>>> >>>
>>> >>>
>>> ipver
4
>>> >>>
>>> >>>
>>> rd
68106:168427529
>>> >>>
>>> >>> alt0
>>> nexthop
10.22.22.22
>>> >>>
>>> >>> alt0 extended community 2562:0:200
>>> >>>
>>> >>> alt0 remote label
833274 <<<<<
>>> >>>
>>> >>> Here, the local labels are seen as part of the LDP database.
>>> >>>
>>> >>> freertr-asbr21#show ipv4 ldp v1 database
>>> >>>
>>> >>> prefix
>>> local remote
hop
>>> >>>
>>> >>> 10.10.10.10/32 898649 451252 785360 10.21.12.1
>>> >>>
>>> >>> 10.10.10.10/32 37034<< 451252 833274 10.21.12.1
>>> >>>
>>> >>> freertr-asbr21#show mpls forwarding
>>> >>>
>>> >>> label vrf iface
hop
>>> label
targets bytes
>>> >>>
>>> >>> 37034<< v1:4 ethernet3 10.21.12.1 451252
>>> 833274
0
>>> >>>
>>> >>> freertr-asbr21#show mpls forwarding 37034
>>> >>>
>>> >>> category
value
>>> >>>
>>> >>>
>>> label
37034
>>> >>>
>>> >>>
>>> key
vrfUni-vrf unicast <<<
>>> >>>
>>> >>> working
true
>>> >>>
>>> >>> forwarder
v1:4
>>> >>>
>>> >>> interface
ethernet3
>>> >>>
>>> >>> nexthop
>>> 10.21.12.1
>>> >>>
>>> >>> remote label 451252 833274 // SWAP 833274 THEN PUSH 451252
>>> >>>
>>> >>> Juniper Business Use Only
>>> >>>
>>> >>>
>>> >>> Juniper Business Use Only
>>> >>>
>>> >>
>>> >>
>>> >> Juniper Business Use Only
>>> >>
>>>
>>>
>>> Juniper Business Use Only
>>>
>>
>>
>> Juniper Business Use Only
>>
Juniper Business Use Only
|