Hi,

I have a problem with bgp peering negociation, some mikrotik anunced bgp capabilities, produces in cisco router that reiniciate session.

Can I moddify Capability Negotiation of mikrotik peer?
Anyone can help me?
This is a great disadvantage when peering with mikrotik to a IXP (Internet Exchange Point).

routeros 4.3 peer configuration:
name="peer-xxxxx-looking-glass" instance=default
remote-address=xx.cisco.ip.xx remote-as=xxciscoasxx
tcp-md5-key="" nexthop-choice=force-self multihop=no
route-reflect=no hold-time=45s
keepalive-time=15s ttl=255 in-filter=xxxx-in out-filter=xxx-out
address-families=ip default-originate=never remove-private-as=no as-override=no passive=no

Mk log:
04:13:34 route,bgp,info Connection opened by remote host
04:13:34 route,bgp,info RemoteAddress=xx.cisco.ip.xx
04:13:34 route,bgp,error Received notification
04:13:34 route,bgp,error OPEN error: unsupported capability
04:13:45 route,bgp,info TCP connection established
04:13:45 route,bgp,info RemoteAddress=xx.cisco.ip.xx
04:13:45 route,bgp,error Received notification
04:13:45 route,bgp,error OPEN error: unsupported capability
04:14:27 route,bgp,info Connection opened by remote host
04:14:27 route,bgp,info RemoteAddress=xx.cisco.ip.xx
04:14:27 route,bgp,error Received notification
04:14:27 route,bgp,error OPEN error: unsupported capability

Cisco log:
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX open active, local address XX.CISCO.IP.XX
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX went from Active to OpenSent
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX sending OPEN, version 4, my as: CISCOAS
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX rcv message type 1, length (excl. header) 26
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX rcv OPEN, version 4
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX rcv OPEN w/ OPTION parameter len: 16
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX rcvd OPEN w/ optional parameter type 2 (Capability) len 14
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX OPEN has CAPABILITY code: 2, length 0
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX OPEN has ROUTE-REFRESH capability(new) for all address-families
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX OPEN has CAPABILITY code: 65, length 4
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX unrecognized capability code: 65 - ingored
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX OPEN has CAPABILITY code: 0, length 0
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX unrecognized capability code: 0 - ingored
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX OPEN has CAPABILITY code: 194, length 171
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX unrecognized capability code: 194 - ingored
*Feb 10 06:50:57.053: BGP: XX.MK.IP.XX went from OpenSent to Closing

Anybody know answer on my question?
Maybe support help?

What happens if you leave out: tcp-md5-key=""
Also, see if you can set the BGP version to 4.

the rest looks good. But I must say that on an IX you should normally come with a Cisco or Juniper. Your peers are not going to like you much for this trouble and they might stop the peering agreements. At least test it to a Cisco on your bench, use the smalles cheapest 2nd hand Cisco with an image that supports BGP (36xx series from eBay?)

cheers,
Nick.

I not think that best response is: Get a cisco (if not used juniper or green boxes are why their government forces them to be subject to interception of communications).

It would be great if Mikrotik people decide is useful implement some things you already do Quagga:
- Capability Negotation
- Route Flap Dampening

http://www.quagga.net/docs/docs-multi/C ... ation.html

Hmmm... all the Internet exchanges that I know prohibit using routers that can't do flap dampening. All the big ones require it.

You can use something else than Cisco or Juniper but what you use must be able to works flawlessly with those two systems and you must know how to configure that before setting up with your peers at the exchange. What you use must be compatible with the rules also so that means route aggregation, flap dampening and filtering.

cheers,
Nick.

It would be great if Mikrotik people decide is useful implement some things you already do Quagga:
- Capability Negotation

RouterOS already supports capability negotiation according to RFC5492

When 4 byte AS capability fixed in ROS 4.x?
In 3.30 ROS works fine.

When we upgrade from 3.30 to 4.6 than our bgp peers goes down, and get this problem.

Any idea for my problem?
I think we need to use again freebsd with openbgpd, because mikrotik don't want to solve this problem.
Or in ROS 4.22 on the next week is it fixed?

if you think it's a bug - please write to support@mikrotik.com. it's Community forum...