Re: Withdrawls and announcements attempt 2

[Curtis Villamizar <[e-mail]>]

Yakov,

Moved to bgp list.

> Please note that propagating withdrawals to all neighbors is
> *not* the problem we are trying to solve now, as such propagation
> accounts for only a small fraction of the total withdraws (see attached).
> 
> In fact, we've yet to see any empirical evidences that propagating
> withdrawals to all neighbors is a problem.

At MaeEast in many cases 30 to 50 peers hear a withdrawl and then
withdraw the same route thenselves.  You would expect to see N times
as many withdraws as was needed for a given withdrawl depending on who
withdrew it and how many Ciscos they peer with.

> Now could we return (perhaps on the BGP list) to the discussion
> about the *real* issue we need to solve - ~5*10^6 daily withdraws.
> 
> Yakov.

If you look at the stats and add up the withdraws and announces and
take the ratio you have a ratio of about 12.  Someone with a Cisco
router that hears a lot of withdraws will have a very high ratio.
Someone that flaps a lot will just cause others to have a very high
ratio.  The ratio of totals should be in line with the average number
of Cisco peers.

This should be sufficient emperical evidence to consider fixing the
problem.  The ratio of 12:1 out of does not seem out of line fora
weighted average number of the number of Ciscos that a given flapper
flaps to.  I think some of the smaller providers do have less peers
than the major providers, so this does seem reasonable to me.

Curtis

Peer                 Packets    Ann        With       Ann+With
ANS (690)            2572       8226       5732       13958   
Advantis (2685)      83         76         59         135     
Alternet (701)       16370      85551      145672     231223  
BBNplanet (AS1)      4223       5643       22486      28129   
BayNetworks (6205)     241        306        321        627     
CAIS (3491)          3043       1285       197688     198973  
CWInet (4445)        2875       67         267503     267570  
CWix (5683)          2317       527        31636      32163   
CWix (5683)          2970       486        141007     141493  
Compuserve (4183)     18         3          19         22      
DIGEX (2548)         1442       253        9323       9576    
DRAnet (1746)        2          2          0          2       
DialNet (5552)       85         35         113        148     
ESnet1 (293)         237        130        682        812     
ESnet2 (293)         243        282        509        791     
EUNet (286)          1931       7167       4577       11744   
Erols (6079)         869        100        11438      11538   
Exodus (3967)        1443       16884      16860      33744   
HLCnet (4565)        2685       11         112495     112506  
INAP.net (5646)      4017       1276       115737     117013  
INSnet (5378)        588        5          7812       7817    
IOSnet (5000)        23         20         7          27      
IconNet (3951)       12         9          15         24      
Interpath (3407)     2895       174        266051     266225  
MAI (6082)           8          29         0          29      
MCI (3561)           8687       24039      198729     222768  
Net99 (3830)         2858       0          217279     217279  
Netcom (2551)        7040       23747      213759     237506  
Netrail (4006)       29         54         12         66      
PIPEX (1849)         14858      2890       366578     369468  
PrimeNet (3549)      15         47         29         76      
SPRINT (1239)        10561      34816      94378      129194  
USCyber (4136)       2921       185        157816     158001  
VoiceNet (3932)      60         57         373        430     
		Totals		214382	   2606695	ratio: 12.2