Re: Prefix 120.29.240.0/21

[Alexandre Snarskii <snar () snar spb ru>]

On Wed, Nov 17, 2010 at 10:19:55AM +0100, Fredy Kuenzler wrote:
> We see a number of session towards downstreams flaps obviously caused by 
> prefix 120.29.240.0/21, originated by AS45158, transited by AS4739 (see 
> below).

The same here, but in my case we're downstream itself :) 

JunOS logs: 

Nov 17 01:28:54.955 2010  <gw> rpd[1391]: bgp_read_v4_update:8283: NOTIFICATION sent to <peer> (External AS 22822): 
code 3 (Update Message Error) subcode 1 (invalid attribute list)
Nov 17 01:28:54.982 2010  <gw> rpd[1391]: Received BAD update from <peer> (External AS 22822), aspath_attr():3055 
PA4_TYPE_AS4PATH(17) => 50 times FLAPPED family inet-unicast(1), prefix 120.29.240.0/21
Nov 17 01:28:55.009 2010  <gw> rpd[1391]: RPD_BGP_NEIGHBOR_STATE_CHANGED: BGP peer <peer> (External AS 22822) changed 
state from Established to Idle (event RecvUpdate)



> Best regards,
>
> Fredy Kuenzler
> Init7 / AS13030
>
>
>
> #sh ip bgp 120.29.240.0
> Number of BGP Routes matching display condition : 4
> Status codes: s suppressed, d damped, h history, * valid, > best, i internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
>     Network            Next Hop        MED    LocPrf Weight Path
> *>i 120.29.240.0/21    206.223.143.99  21     150    0      4739 45158 
> {64512 64514 64516 64519 64521 64522 64525 64526 64528 64529 64530 64535 
> 64537 64538 64541 64542 64543 64544 64545 64546 64547 64548 64549 64552 
> 64553 64556 64557 64560 64561 64562 64564 64565 64566 64568 64569 64570 
> 64574 64575 64576 64577 64578 64580 64582 64583 64584 64588 64593 64598 
> 64599 64601 64602 64605 64610 64611 64620 64621 65397 65398 65470 65471 
> 65472 65473 65474 65479 65480 65484 65485 65490 65502 65505 65511 65514 
> 65523 65524 65528 65534 65609} ?
> *i  120.29.240.0/21    206.223.143.99  21     150    0      4739 45158 
> {64512 64514 64516 64519 64521 64522 64525 64526 64528 64529 64530 64535 
> 64537 64538 64541 64542 64543 64544 64545 64546 64547 64548 64549 64552 
> 64553 64556 64557 64560 64561 64562 64564 64565 64566 64568 64569 64570 
> 64574 64575 64576 64577 64578 64580 64582 64583 64584 64588 64593 64598 
> 64599 64601 64602 64605 64610 64611 64620 64621 65397 65398 65470 65471 
> 65472 65473 65474 65479 65480 65484 65485 65490 65502 65505 65511 65514 
> 65523 65524 65528 65534 65609} ?
> *i  120.29.240.0/21    206.223.143.99  21     150    0      4739 45158 
> {64512 64514 64516 64519 64521 64522 64525 64526 64528 64529 64530 64535 
> 64537 64538 64541 64542 64543 64544 64545 64546 64547 64548 64549 64552 
> 64553 64556 64557 64560 64561 64562 64564 64565 64566 64568 64569 64570 
> 64574 64575 64576 64577 64578 64580 64582 64583 64584 64588 64593 64598 
> 64599 64601 64602 64605 64610 64611 64620 64621 65397 65398 65470 65471 
> 65472 65473 65474 65479 65480 65484 65485 65490 65502 65505 65511 65514 
> 65523 65524 65528 65534 65609} ?
> *   120.29.240.0/21    77.67.76.237    1546   150    0      3257 7473 7474 
> 9300 45158 i
>        Last update to IP routing table: 0h25m47s, 1 path(s) installed:
>        Route is advertised to 1 peers:
>         213.144.128.180(13030)

-- 
In theory, there is no difference between theory and practice. 
But, in practice, there is.