Top 50 unstable DVMRP routes
- Date: Mon, 18 May 1998 10:37:26 PDT
Dear MBone and MBone-EU-OP mailing lists,
Enclosed is the list of this week's worst DVMRP flappers.
Please see the end of this message for more information.
AS #srcs #down(%) #flapping Route Rank avg.flaps/hour
------- ----- ---------- --------- ------------------- ---- --------------
0 42 3(7%) 13(30%) 10/8 4 120
7018 3 1(33%) 1(33%) 12.3.167.0/25 35 21
41 8 1(12%) 1(12%) 128.102.32/20 16 54
209 43 43(100%) 32(74%) 128.138.193/24 40 15
1347 328 83(25%) 192(58%) 128.162.1/24 22 46
2553 1 0(0%) 1(100%)128.186/16 45 9
786 285 67(23%) 221(77%) 128.240.1.96/27 32 27
668 28 2(7%) 20(71%) 129.29.125/24 14 55
224 28 0(0%) 28(100%)129.241/16 9 75
2833 1 0(0%) 1(100%)130.239/16 13 56
2831 1 0(0%) 1(100%)130.240/16 11 57
87 233 8(3%) 62(26%) 134.68.31.134/32 36 19
5058 6 0(0%) 6(100%)134.207.64/18 50 7
1275 926 389(42%) 415(44%) 141.39/16 17 53
237 67 7(10%) 46(68%) 141.212.162/23 49 7
766 219 51(23%) 176(80%) 150.244.109/24 23 36
1849 1 0(0%) 1(100%)158.43/16 29 28
5688 7 0(0%) 2(28%) 159.33/16 28 28
3749 1 0(0%) 1(100%)161.45/16 30 28
3384 1 0(0%) 1(100%)165.254.14/24 31 27
2563 9 9(100%) 6(66%) 168.131.39/24 37 17
163 1 0(0%) 1(100%)192.35.232.144/29 33 26
194 8 6(75%) 2(25%) 192.52.106/24 12 57
3112 2 2(100%) 1(50%) 192.148.249/24 46 8
1653 81 5(6%) 80(98%) 193.10.96/24 10 58
1 212 19(8%) 20(9%) 198.78.51/24 38 16
3909 2 2(100%) 2(100%)198.243.24/24 48 8
6435 15 2(13%) 5(33%) 199.222.46.5/32 24 34
-1 352 63(17%) 68(19%) 202.8.94/24 1 202
1237 50 3(6%) 50(100%)203.247.194/24 34 25
2711 3 0(0%) 3(100%)204.116.63/24 41 10
145 20 1(5%) 10(50%) 204.147.128/24 5 118
2381 6 3(50%) 1(16%) 204.147.143/24 18 51
4137 1 0(0%) 1(100%)204.177.0/24 43 9
3915 4 0(0%) 4(100%)204.182.44/24 26 29
2828 9 0(0%) 1(11%) 205.158.0/24 6 118
1239 22 3(13%) 14(63%) 205.166.205/24 25 29
3582 2 0(0%) 1(50%) 205.167.76/24 8 118
5778 2 0(0%) 2(100%)205.244.200/21 47 8
5754 12 1(8%) 11(91%) 206.127.228/22 15 54
6297 7 1(14%) 3(42%) 207.76.136/24 7 118
3967 683 4(0%) 677(99%) 207.82.0/24 2 137
701 34 1(2%) 20(58%) 207.82.54/24 19 49
10633 1 0(0%) 1(100%)207.82.209/24 21 46
6480 2 0(0%) 2(100%)207.82.218/24 20 48
1785 29 4(13%) 26(89%) 207.127.96/19 42 10
4277 1 0(0%) 1(100%)208.213.150.0/26 3 123
6955 45 7(15%) 43(95%) 209.57.92/24 39 16
6541 1 0(0%) 1(100%)209.84.64/21 27 28
4713 3 3(100%) 3(100%)210.154.149.64/26 44 9
UCLA and PARC are engaged in MBone monitoring and
measurement. One of the major problems with the current DVMRP
MBone is route instability. Most of the instability appears to
be caused by pathologies as opposed to real link or router
instability. DVMRP does not handle instability well, so it's to
everyone's benefit to eliminate these pathologies. This
periodic message is meant to point out the routes that appear
unstable in the hopes that the cause of the instability will be
corrected.
More information on the data collection is available from
http://ganef.cs.ucla.edu/~masseyd/Route/
More information on the known bugs which cause instability
is available from
http://ganef.cs.ucla.edu/~masseyd/Route/bugs.html
We are still experimenting with the best format in which to
present this information. We're currently grouping routes
by unicast AS number, and only reporting the worst offender
in a given AS. Other unstable routes in the same AS can be
found by referring to the "AS Number Search" from the search
menu of the above web page, or by looking at this week's or
this month's current data on the web page.
The fields in the following table are:
AS:
The AS number associated with the source in the unicast
routing table. This may be the route's source, or may be
the route's source's unicast provider, who may or may not
be their multicast provider.
#sources:
The number of sources in the DVMRP routing table associated
with this AS.
#down:
The number of above sources whose DVMRP routes are currently
considered down.
#flapping:
The number of above sources whose DVMRP routes are experiencing
routing instability during this period.
Route:
The most unstable route in the AS over the measurement period.
Rank:
The rank (by flaps/hour) of this route in the top AS's.
flaps/hour:
The average flaps-per-hour of the most unstable route.
A stable route never flaps; if a link goes down and
comes back up routes related to it might flap once or
twice. A route which flaps, on average, more than once
per hour over a week's time, is clearly either behind a
link that goes up and down about once an hour (which
deserves to be investigated) or is experiencing a
pathology like those listed on the above-referenced bugs
page (which deserves to be investigated).
The table lists the 50 worst AS's, sorted by the IP address of the
most unstable route in the AS, with an additional rank by most unstable
route in the AS. This data is from a single point of view at
UCLA; the data is of course colored by its collection point. In
particular, network problems close to the collection point can
raise the perceived instability for a large number of sources.
However, we believe that averaging over the week lessens these
effects greatly, so although there may be occasional blips, in
general if you're in this table, you should try to find out
why.
------- End of Forwarded Message
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