Hi Chuck, I applied the command (hidden/ undocumented) and it worked.
M10i already has many peers that support *2 byte asn only* and is running without any issues, but *why it is not able to negotiate with Maipu to make the peer up without disabling the 4byte asn capability*. ASFAIK, 4 byte ASN or AS4_PATH is an optional transitive attribute unlike AS_PATH mandatory attribute. My asmuntion is BGP new_speaker may send AS4_PATH to its neighbor an OPEN message with capability check, if fail it should have to use AS_PATH or 2 byte to negotiate to its OLD-BGP speakers and make the peer up. *The question is why JunOs failed with Maipu ? * Thank you, Khagendra Dhakal On Thu, May 20, 2010 at 9:31 PM, Chuck Anderson <c...@wpi.edu> wrote: > set neighbor w.x.y.z disable-4byte-as > > On Thu, May 20, 2010 at 09:03:55PM +0545, khagendra dhakal wrote: >> Dear all, >> >> Platform: M10i >> JUNOS: JUNOS 9.2R2.15 >> >> Platform: Maipu 2800 >> IOS: rp8-i-6.1.37(xnwt-11).bin), version 6.1.37 >> >> >> PROBLEM: Has anyone had any bad experience on bgp peering between the >> above mentioned Devices with the following error: ? >> >> Error: >> BGP RECV xxx.xxx.xxx.xxx+3407 -> xxx.xxx.xxx.xxx+179 >> BGP RECV message type 3 (Notification) length 27 >> BGP RECV Notification code 2 (Open Message Error) subcode 7 >> (unsupported capability) >> BGP RECV Data (6 bytes): 41 04 00 00 b3 15 >> bgp_peer_close: closing peer xxx.xxx.xxx.xxx (External AS xxxxx), >> state is 5 (OpenConfirm) >> bgp_close_socket: peer xxx.xxx.xxx.xxx (External AS xxxxx) >> ........................... >> ............................ >> advertising receiving-speaker only capabilty to neighbor >> xxx.xxx.xxx.xxx (External AS xxxxx) >> bgp_4byte_aspath_add_cap():153 AS4-Peer xxx.xxx.xxx.xxx (External AS >> xxxxx)(SEND): 4 byte AS capability added, AS xxxxx >> >> Please suggest the appropriate solution to get out of this issue. > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp