[dev] Problems regarding BGP code 2, sub-code 7 when peering with Cisco IOS-XR Version 4.2.3 over IPv6
Daniel Walton
dwalton at cumulusnetworks.com
Tue Sep 26 14:19:50 EDT 2017
Hi Christoffer,
FRR will always advertise the capability for "RX addpath" but we will only
advertise "TX addpath" if you configure one of the "neighbor x.x.x.x
addpath...." knobs. In your case it sounds like XR is getting confused
about us sending the "RX addpath" capability on a v6 session. That
shouldn't cause it to send a NOTIFICATION though so I am wondering if maybe
we are formatting something incorrectly in the OPEN. Any chance you can
get a .pcap of the session that is bouncing?
thx
Daniel
On Tue, Sep 26, 2017 at 12:06 PM, Christoffer Hansen <netravnen at gmail.com>
wrote:
> FRRouting-Dev <dev at lists.frrouting.org>
>
>
> Hit an interesting issue today. (for reference a lot of technical
> details below)
>
> I found myself unable to locate the option of turning BGP code 2,
> sub-code 7 off when sending capabilities to a neighbor. (Spent some time
> googling around but mostly found Cisco IOS-XR related stuff)
>
> It appears Cisco IOS-XR does not yet support the use off
> 'additional-paths' (BGP code 2, sub-code 7) when exchanging neighbor
> capabilities. But ONLY for IPv6 (IPv4 is supported).
>
> So my question to the list (if anyone finds the time to answer) is: Does
> FFRouting contain an option to turn off the multi-path feature /
> specific sub-code when announcing BGPv4 capabilities to it's neighbor(s)
> over IPv6 (or both IPv4/v6) ?
>
> Nb: And yes. Have tried disabling sending capabilities to the IOS-XR
> router altogether. But the the Cisco router just refuses because no
> capabilities is announced from neighbor.
>
> Nb(2): Capability option is set to 'Dynamic' when announcing to neighbor.
>
> --
> Regards,
> Christoffer.
> gpg: c8b3 82a8 a1cd cdb7 71fe b24c c654 948f da86 becd
>
>
> Software Details
> ================
>
> pfSense v2.3.4
> --------------
> * Name: frr
> * Category: net
> * Version: 0.0.2
> * Description: FRR routing daemon for BGP, OSPF, and OSPF6 Conflicts
> with Quagga OSPF and OpenBGPD. These packages cannot be installed at the
> same time.
>
>
> Debug output from Cisco IOS XR Software, Version 4.2.3[Default]
> ===============================================================
>
> * NOTE(1): IPv6 network prefix replaced with '2001:db8::'
>
> RP/0/RSP0/CPU0:Sep 26 16:49:36.532 MEST: bgp[1048]: [default-ioct] VRF
> Internet: 2001:db8:::250:56ff:febd:7e57 went from Idle to Connect
> RP/0/RSP0/CPU0:Sep 26 16:49:36.754 MEST: bgp[1048]: [default-iord] VRF
> Internet: Received message from 2001:db8:::250:56ff:febd:7e57 with type
> 1, length (incl. header) 102
> RP/0/RSP0/CPU0:Sep 26 16:49:36.754 MEST: bgp[1048]: [default-iord] VRF
> Internet: Receive message dump for 2001:db8:::250:56ff:febd:7e57:
> RP/0/RSP0/CPU0:Sep 26 16:49:36.754 MEST: bgp[1048]: [default-iord] VRF
> Internet: ffff ffff ffff ffff ffff ffff ffff ffff
> RP/0/RSP0/CPU0:Sep 26 16:49:36.755 MEST: bgp[1048]: [default-iord] VRF
> Internet: 0066 0104 ff4c 0078 5774 0604 4902 0601
> RP/0/RSP0/CPU0:Sep 26 16:49:36.755 MEST: bgp[1048]: [default-iord] VRF
> Internet: 0400 0100 0102 0280 0002 0202 0002 0641
> RP/0/RSP0/CPU0:Sep 26 16:49:36.755 MEST: bgp[1048]: [default-iord] VRF
> Internet: 0400 00ff 4c02 0645 0400 0101 0102 0242
> RP/0/RSP0/CPU0:Sep 26 16:49:36.756 MEST: bgp[1048]: [default-iord] VRF
> Internet: 0002 0243 0002 1949 1715 6677 3031 2e6c
> RP/0/RSP0/CPU0:Sep 26 16:49:36.756 MEST: bgp[1048]: [default-iord] VRF
> Internet: 6162 2e6e 6574 7261 766e 656e 2e65 7500
> RP/0/RSP0/CPU0:Sep 26 16:49:36.756 MEST: bgp[1048]: [default-iord] VRF
> Internet: 0204 4002 8078
> RP/0/RSP0/CPU0:Sep 26 16:49:36.756 MEST: bgp[1048]: [default-iord] VRF
> Internet: Received OPEN from 2001:db8:::250:56ff:febd:7e57, version 4,
> holdtime 120 secs
> RP/0/RSP0/CPU0:Sep 26 16:49:36.756 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has optional parameter
> type: 2 (Capability) len: 6
> RP/0/RSP0/CPU0:Sep 26 16:49:36.756 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has
> MULTIPROTOCOL_EXTENSION capability for afi/safi: 1/1
> RP/0/RSP0/CPU0:Sep 26 16:49:36.757 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has optional parameter
> type: 2 (Capability) len: 2
> RP/0/RSP0/CPU0:Sep 26 16:49:36.757 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has ROUTE-REFRESH
> capability(old) for all address-families
> RP/0/RSP0/CPU0:Sep 26 16:49:36.757 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has optional parameter
> type: 2 (Capability) len: 2
> RP/0/RSP0/CPU0:Sep 26 16:49:36.757 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has ROUTE-REFRESH
> capability for all address-families
> RP/0/RSP0/CPU0:Sep 26 16:49:36.757 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has optional parameter
> type: 2 (Capability) len: 6
> RP/0/RSP0/CPU0:Sep 26 16:49:36.757 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has 4-byte AS
> capability with AS 65356
> RP/0/RSP0/CPU0:Sep 26 16:49:36.758 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has optional parameter
> type: 2 (Capability) len: 6
> RP/0/RSP0/CPU0:Sep 26 16:49:36.758 MEST: bgp[1048]: [default-iord] VRF
> Internet: 2001:db8:::250:56ff:febd:7e57 Addr-family 1/1 not supported:
> Ignoring the ADDPATH capability
> RP/0/RSP0/CPU0:Sep 26 16:49:36.758 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has optional parameter
> type: 2 (Capability) len: 2
> RP/0/RSP0/CPU0:Sep 26 16:49:36.758 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has unrecognized
> capability code: 66, length 0 (ignored)
> RP/0/RSP0/CPU0:Sep 26 16:49:36.758 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has optional parameter
> type: 2 (Capability) len: 2
> RP/0/RSP0/CPU0:Sep 26 16:49:36.759 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has unrecognized
> capability code: 67, length 0 (ignored)
> RP/0/RSP0/CPU0:Sep 26 16:49:36.759 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has optional parameter
> type: 2 (Capability) len: 25
> RP/0/RSP0/CPU0:Sep 26 16:49:36.759 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has unrecognized
> capability code: 73, length 23 (ignored)
> RP/0/RSP0/CPU0:Sep 26 16:49:36.759 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has optional parameter
> type: 2 (Capability) len: 4
> RP/0/RSP0/CPU0:Sep 26 16:49:36.759 MEST: bgp[1048]: [default-iord] VRF
> Internet: bgp_io_read_schedule_updgrp: NO updgrp scheduled after Open
> processing: nbr=2001:db8:::250:56ff:febd:7e57, nbrfl=0x08314080
> RP/0/RSP0/CPU0:Sep 26 16:49:36.759 MEST: bgp[1048]: [default-iord] VRF
> Internet: 2001:db8:::250:56ff:febd:7e57 went from Connect to OpenSent
> RP/0/RSP0/CPU0:Sep 26 16:49:36.760 MEST: bgp[1048]: [default-iord] VRF
> Internet: Sending OPEN to 2001:db8:::250:56ff:febd:7e57, version 4, my
> as: 31027, holdtime 120 seconds
> RP/0/RSP0/CPU0:Sep 26 16:49:36.760 MEST: bgp[1048]: [default-iord] VRF
> Internet: OPEN from 2001:db8:::250:56ff:febd:7e57 has capabilities with
> no supported address-family.
> RP/0/RSP0/CPU0:Sep 26 16:49:36.760 MEST: bgp[1048]: [default-iord] VRF
> Internet: Sending NOTIFICATION 2/7 (unsupported/disjoint capability) to
> 2001:db8:::250:56ff:febd:7e57 (0 bytes: )
> RP/0/RSP0/CPU0:Sep 26 16:49:36.760 MEST: bgp[1048]: [default-iord] VRF
> Internet: 2001:db8:::250:56ff:febd:7e57 went from OpenSent to Closing
> RP/0/RSP0/CPU0:Sep 26 16:49:36.761 MEST: bgp[1048]: [default-ioct] VRF
> Internet: 2001:db8:::250:56ff:febd:7e57 send message type 3, length
> (incl. header) 21
> RP/0/RSP0/CPU0:Sep 26 16:49:36.761 MEST: bgp[1048]: [default-ioct] VRF
> Internet: Send message dump for 2001:db8:::250:56ff:febd:7e57:
> RP/0/RSP0/CPU0:Sep 26 16:49:36.761 MEST: bgp[1048]: [default-ioct] VRF
> Internet: ffff ffff ffff ffff ffff ffff ffff ffff
> RP/0/RSP0/CPU0:Sep 26 16:49:36.761 MEST: bgp[1048]: [default-ioct] VRF
> Internet: 0015 0302 07
> RP/0/RSP0/CPU0:Sep 26 16:49:36.762 MEST: bgp[1048]: [default-event] VRF
> Internet: 2001:db8:::250:56ff:febd:7e57 went from Closing to Idle
> RP/0/RSP0/CPU0:Sep 26 16:49:36.762 MEST: bgp[1048]: [default-event] VRF
> Internet: 2001:db8:::250:56ff:febd:7e57 reset due to BGP Notification sent
>
>
> Output from pfSense FRR routing daemon
> ======================================
>
> * NOTE(1): IPv6 network prefix replaced with '2001:db8::'
> * NOTE(2): IPv4 next-hop replaced with TEST-NET-3 address 203.0.113.4
>
> BGP neighbor is 2001:db8::1, remote AS #ISP-ASN#, local AS 65356,
> external link
> BGP version 4, remote router ID 0.0.0.0
> BGP state = Idle
> Last read 00:00:27, Last write 00:00:11
> Hold time is 120, keepalive interval is 40 seconds
> Message statistics:
> Inq depth is 0
> Outq depth is 0
> Sent Rcvd
> Opens: 4 0
> Notifications: 0 4
> Updates: 0 0
> Keepalives: 0 0
> Route Refresh: 0 0
> Capability: 0 0
> Total: 4 4
> Minimum time between advertisement runs is 0 seconds
> Update source is 2001:db8::250:56ff:febd:7e57
>
> For address family: IPv4 Unicast
> Not part of any update group
> Community attribute sent to this neighbor(extended)
> 0 accepted prefixes
>
> Connections established 0; dropped 0
> Last reset 00:00:27, due to NOTIFICATION received (OPEN Message
> Error/Unsupported Capability)
> Local host: 2001:db8::250:56ff:febd:7e57, Local port: 57277
> Foreign host: 2001:db8::1, Foreign port: 179
> Nexthop: 203.0.113.4
> Nexthop global: 2001:db8::250:56ff:febd:7e57
> Nexthop local: fe80::250:56ff:febd:7e57
> BGP connection: shared network
> BGP Connect Retry Timer in Seconds: 120
> Next start timer due in 5 seconds
> Read thread: off Write thread: off
>
>
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