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  • 1.  Removing connection to one BGP peer resets connectivity?

    Posted 04-04-2024 17:35

    Hello, I removed the physical connection to the 2nd BGP peer and lost Internet connectivity.  The 1st BGP peer which is preferred was still up.  It seems like removing the 2nd one caused some type of reset.  Is this expected?  It was re-connected, but I think the Internet came back before I did that.  So I'm wondering if a 30 second outage would be expected in this scenario.  Thanks for any insight.

    Apr  4 13:57:42  MX-01 rpd[2327]: bgp_ifachange_group:10534: NOTIFICATION sent to 64.124.44.250 (External AS 6461): code 6 (Cease) subcode 9 (Hard Reset) [code 6 (Cease) subcode 6 (Other Configuration Change)], Reason: Interface change for the peer-group



    ------------------------------
    JEFF ROWAN
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  • 2.  RE: Removing connection to one BGP peer resets connectivity?

    Posted 04-04-2024 20:28

    Have you thought about setting "priority" on both

    interfaces. One lower than the other. In host

    connectivity it's 0-7 or 1-7, or similar. But in

    other uses its a much higher number to

    contend with. Skip your highest metric with

    priorities. Perhaps.



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------



  • 3.  RE: Removing connection to one BGP peer resets connectivity?

    Posted 04-17-2024 14:56

    Hi,

    Can you share the BGP configuration and show route 0/0 output? Also, do you have the output of show log messages from that time?

    Regards



    ------------------------------
    Sheetanshu Shekhar
    ------------------------------



  • 4.  RE: Removing connection to one BGP peer resets connectivity?

    Posted 04-18-2024 13:54

    Thanks for your help.  The only log entry was the one showing the disconnection: 

    Apr  4 13:57:42  MX-01 rpd[2327]: bgp_ifachange_group:10534: NOTIFICATION sent to 64.124.44.250 (External AS 6461): code 6 (Cease) subcode 9 (Hard Reset) [code 6 (Cease) subcode 6 (Other Configuration Change)], Reason: Interface change for the peer-group

    This is the config:

    protocols {
        bgp {
            group eBGP {
                type external;
                export adv-bgp;
                neighbor 164.104.199.198 {
                    authentication-key "$9$jXim5Fn9u01n6Au1Iyr4oJ"; ## SECRET-DATA
                    peer-as 12145;
                }
                neighbor 64.124.44.250 {
                    preference 180;
                    local-address 64.124.44.251;
                    peer-as 6461;
                    local-as 54060;
                }
            }
            graceful-restart;
        }

    jeff@MX-01> show route 0/0

    inet.0: 14 destinations, 15 routes (14 active, 0 holddown, 0 hidden)
    + = Active Route, - = Last Active, * = Both

    0.0.0.0/0          *[BGP/170] 5w2d 03:52:55, localpref 100
                          AS path: 12145 I, validation-state: unverified
                        >  to 164.104.199.198 via ae0.0
                        [BGP/180] 1w6d 21:51:31, MED 0, localpref 100
                          AS path: 6461 I, validation-state: unverified
                        >  to 64.124.44.250 via xe-0/0/2.0
    1.1.1.1/32         *[Direct/0] 12w5d 16:54:33
                        >  via lo0.0
    10.1.1.1/32        *[Local/0] 12w5d 16:53:07
                           Reject
    64.124.44.250/31   *[Direct/0] 1w6d 21:51:34
                        >  via xe-0/0/2.0
    64.124.44.251/32   *[Local/0] 1w6d 21:51:34
                           Local via xe-0/0/2.0
    164.104.0.0/16     *[Static/5] 5w1d 05:35:44
                        >  to 164.104.199.201 via irb.10
    164.104.1.95/32    *[Static/5] 5w2d 03:03:53
                        >  to 164.104.197.1 via fxp0.0
    164.104.5.0/24     *[Static/5] 12w5d 16:54:33
                        >  to 164.104.197.1 via fxp0.0
    164.104.197.0/24   *[Direct/0] 12w5d 16:54:33
                        >  via fxp0.0
    164.104.197.15/32  *[Local/0] 12w5d 16:54:33
                           Local via fxp0.0
    164.104.199.192/29 *[Direct/0] 5w2d 03:52:56
                        >  via ae0.0
    164.104.199.197/32 *[Local/0] 5w2d 03:52:56
                           Local via ae0.0
    164.104.199.200/29 *[Direct/0] 5w1d 05:35:44
                        >  via irb.10
    164.104.199.203/32 *[Local/0] 5w1d 05:35:44
                           Local via irb.10



    ------------------------------
    JEFF ROWAN
    ------------------------------