It would be great if BGP neighbours with IPv6 link-local addresses and interface alias were possible.
admin@rt-1# set protocols bgp ASN neighbor fe80::42%eth1 "fe80::42%eth1" is not a valid value Value validation failed Set failed
Description
Description
Details
Details
- Difficulty level
- Unknown (require assessment)
- Version
- -
- Why the issue appeared?
- Will be filled on close
- Is it a breaking change?
- Unspecified (possibly destroys the router)
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It is not possible to use this exact syntax in FRR, and it's not possible to fake it in the current BGP script either. It is possible to add a new "interface" option to match the FRR CLI though.
In my experimental change it seems to work:
vyos@vyos-test-1# set protocols bgp 64444 neighbor fe80::46 interface eth1 [edit] vyos@vyos-test-1# commit [edit] vyos@vyos-test-1# vtysh -c 'sh run' | grep fe80::46 neighbor fe80::46 remote-as 63334 neighbor fe80::46 interface eth1
Of course it needs real life testing.
This comment was removed by MrXermon.
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The BGP seems to be working but the summary is not quite correct (State/PfxRcd is wrong).
admin@rt-1:~$ show ipv6 bgp summary IPv6 Unicast Summary: BGP router identifier 172.20.178.96, local AS number 4242423506 vrf-id 0 BGP table version 861 RIB entries 454, using 67 KiB of memory Peers 8, using 164 KiB of memory Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd fdb4:4911:ccf8::97 4 4242423506 955 581 0 0 0 00:17:52 233 fe80::42:194 4 4242423934 331 247 0 0 0 00:12:18 0 fe80::465:1337:1 4 4242420131 205 194 0 0 0 00:03:14 0 Total number of neighbors 3
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Found another bug. Routes are shown via received-routes but with a wrong next-hop address (:: instead of fe80::465:1337:1 in my case) and they are not installed in the FIB.
admin@rt-1:~$ show ipv6 bgp neighbors fe80::465:1337:1 routes
admin@rt-1:~$ show ipv6 bgp neighbors fe80::465:1337:1 received-routes
BGP table version is 0, local router ID is 172.20.178.96, vrf id 0
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> fd00:4242:3348::/48
:: 0 4242420131 4242422601 4242422950 4242423348 i
*> fd00:65a8:93a4::/48
:: 0 4242420131 4242421191 65026 4242421271 4242422800 65142 i
*> fd00:aaaa:251::/48
:: 0 4242420131 4242423934 4242420144 i
*> fd00:aaaa:255::/48
:: 0 4242420131 4242423934 4242420144 i
*> fd00:aaaa:256::/48
:: 0 4242420131 4242423905 4242420022 4242422777 4242420117 i
*> fd01:67c:2ed8::/48
:: 0 4242420131 4242423905 65043 65038 i
*> fd04:52c0:4000::/48
:: 0 4242420131 4242423905 4242423585 i
*> fd0a:3599:3930::/48
:: 0 4242420131 4242423905 64737 4242421233 i
*> fd0b:21e1:fd0b::/64
:: 0 4242420131 4242420789 76190 76175 4242420002 i
*> fd10:1074:41f6::/48
:: 0 4242420131 4242423934 4242420138 64752 i
*> fd12:ee00:9898::/48
:: 0 4242420131 4242423640 iComment Actions
@MrXermon were you able to workaround the next hop issue you describe here as I am getting the same result from my peers?
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Sadly not. I can reproduce the error but i am not able to fix the problem in the code.
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Is there any way I can help test this? I was trying to setup the same, but lack of link-local support prevents me from adding a v6 BGP peer without allocating IP addresses to the link.
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I would like to test as well. I have successfully setup link local peering with 2 vyos routers using the new "interface v6only" option. However, I am unable to establish a link local session when peering with a different vendor.
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Hi, any updates on this?
I'm really having a hard time peering using link-local addresses...
If I can help in some way.... i'm here ;)
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this is very similar to https://phabricator.vyos.net/T3657 , so it seems that this is going to be fixed in 1.4 ( proof https://forum.vyos.io/t/bgp-peering-with-ipv6-link-local-addresses/7309/14 ). Is this going to be backported to 1.3 ? Anyone is able to find the commit that introduced the feature on 1.4? Maybe it is something easy to patch