[nsp] troubleshooting stuck in active routes

From: CLAEREBOUDT Elke (ECLAEREB@mail.mobistar.be)
Date: Thu Oct 04 2001 - 05:25:10 EDT


Hi,

We are experiencing a lot of stuck in actieve routes on our network, not
that bad problem, but it also causes clearing of eigrp neighbourships which
is troubling is a bit more.
I could trace the problem.
The problem occurs when a router dials in on a pop with a fix ip address.
Those addresses are know as rip routes which then are redistributed in the
eigrp all over the network.
When those routes dissapear, we sometimes have the SIA's and the clearing of
neighbourships. It isn't always the same router which isn't responding to
the queries, there's really no line that is congested, no trouble with cpu
or memory.
There seems to be a loop in the queries.
In the example I include it shows that RA waits for a response from RB, RB
from RD, RD from RE, RE from RF, and RF from RA, maybe not in that sequence
At the end it is RE which says that the route is SIA and clears the
neighbourship with RF.
Is this a problem which we can solve, ( summarizing the flapping routes is
not a solution for us) ?
I understand why the routes are going in SIA, but I don't get it why all
routers don't respond in time, it's not a big network, so a timeout of 3 min
should cause not such a problem.

Thanks

Elke

RA#sh ip eigrp top ac
IP-EIGRP Topology Table for AS(1)/ID(10.1.1.221)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - Reply status

A 20.1.1.1/32, 1 successors, FD is Inaccessible
    1 replies, active 00:00:01, query-origin: Successor Origin
         via 10.1.1.194 (Infinity/Infinity), ATM1/0.2, serno 5749193
         via 10.1.1.198 (Infinity/Infinity), ATM1/0.3, serno 5749206
         via 10.1.1.237 (Infinity/Infinity), r, ATM1/0.9, serno 5749208
         via 10.1.1.78 (Infinity/Infinity), ATM1/0.8, serno 5749207
         via 10.1.1.202 (Infinity/Infinity), ATM1/0.6, serno 5749203
         via 10.1.1.30 (Infinity/Infinity), ATM1/0.5, serno 5749210
         via 10.1.1.206 (Infinity/Infinity), ATM1/0.4, serno 5749209

RA#sh ip route 20.1.1.1
Routing entry for 20.1.1.1/32
  Known via "eigrp 1", distance 170, metric 76800, type external
  Redistributing via eigrp 1, ospf 1
  Advertised by ospf 1 metric 25 subnets route-map eigrp-to-ospf
  Last update from 10.1.1.194 on ATM1/0.2, 00:00:15 ago
  Routing Descriptor Blocks:
  * 10.1.1.194, from 10.1.1.194, 00:00:15 ago, via ATM1/0.2
      Route metric is 76800, traffic share count is 1
      Total delay is 740 microseconds, minimum bandwidth is 44247 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 95/255, Hops 5

RA#sh in atm1/0.9
ATM1/0.9 is up, line protocol is up
  Hardware is ENHANCED ATM PA, address is 0030.b669.ec1c (bia
0030.b669.ec1c)
  Description: === atm PVC to RB.3Mb === Internet address is 10.1.1.238/30
  MTU 4470 bytes, BW 44209 Kbit, DLY 190 usec, rely 255/255, load 1/255
  Encapsulation ATM
  4816902 packets input, 430296115 bytes
  4499756 packets output,336826107 bytes
  1230339 OAM cells input, 1230366 OAM cells output
  AAL5 CRC errors : 7
  AAL5 SAR Timeouts : 0
  AAL5 Oversized SDUs : 0
RA#
RA#
RA#sh ip eigrp top ac
IP-EIGRP Topology Table for AS(1)/ID(10.1.1.221)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - Reply status

A 20.1.1.1/32, 1 successors, FD is Inaccessible
    1 replies, active 00:02:49, query-origin: Successor Origin
         via 10.1.1.194 (Infinity/Infinity), ATM1/0.2, serno 5749193
         via 10.1.1.198 (Infinity/Infinity), ATM1/0.3, serno 5749206
         via 10.1.1.237 (Infinity/Infinity), r, ATM1/0.9, serno 5749208
==> RB
         via 10.1.1.78 (Infinity/Infinity), ATM1/0.8, serno 5749207
         via 10.1.1.202 (Infinity/Infinity), ATM1/0.6, serno 5749203
         via 10.1.1.30 (Infinity/Infinity), ATM1/0.5, serno 5749210
         via 10.1.1.206 (Infinity/Infinity), ATM1/0.4, serno 5749209
RA#

RB#sh ip eigrp top act
IP-EIGRP Topology Table for AS(1)/ID(10.1.1.67)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

A 20.1.1.1/32, 1 successors, FD is Inaccessible
    1 replies, active 00:00:25, query-origin: Successor Origin
         via 10.1.1.238 (Infinity/Infinity), ATM2/0.71
         via 10.1.1.166 (Infinity/Infinity), ATM2/0.52, serno 12357758
         via 10.1.1.242 (Infinity/Infinity), ATM2/0.91, serno 12357760
         via 212.65.33.165 (Infinity/Infinity), ATM2/0.72, serno 12357761
         via 10.1.1.246 (Infinity/Infinity), r, ATM2/0.92, serno 12357759
         via 10.1.1.150 (Infinity/Infinity), ATM2/0.51, serno 12357754

RB#sh ip route 20.1.1.1
Routing entry for 20.1.1.1/32
  Known via "eigrp 1", distance 170, metric 81664, type external
  Redistributing via eigrp 1
  Last update from 10.1.1.238 on ATM2/0.71, 00:00:34 ago
  Routing Descriptor Blocks:
  * 10.1.1.238, from 10.1.1.238, 00:00:34 ago, via ATM2/0.71
      Route metric is 81664, traffic share count is 1
      Total delay is 930 microseconds, minimum bandwidth is 44247 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 95/255, Hops 6

RB#
RB#sh in atm2/0.92
ATM2/0.92 is up, line protocol is up
  Hardware is ENHANCED ATM PA
  Description: === pvc to RD (dlci 54) ===
  Internet address is 10.1.1.245/30
  MTU 4470 bytes, BW 44209 Kbit, DLY 190 usec,
     reliability 255/255, txload 1/255, rxload 5/255
  Encapsulation ATM
  16518379 packets input, 1309947878 bytes
  20636595 packets output,2463282671 bytes
  1096686 OAM cells input, 1096708 OAM cells output
  AAL5 CRC errors : 1
  AAL5 SAR Timeouts : 0
  AAL5 Oversized SDUs : 0
RB#

RD#sh ip eigrp top act
IP-EIGRP Topology Table for AS(1)/ID(10.1.1.181)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - Reply status

A 20.1.1.1/32, 1 successors, FD is Inaccessible
    1 replies, active 00:01:25, query-origin: Successor Origin
         via 10.1.1.245 (Infinity/Infinity), Serial0/0.54
         via 10.1.1.253 (Infinity/Infinity), Serial0/0.53, serno 16665111
         via 10.1.1.29 (Infinity/Infinity), Serial0/0.8, serno 16665109
         via 10.1.1.217 (Infinity/Infinity), Serial0/0.3, serno 16665113
    Remaining replies:
         via 10.1.1.73, r, Serial0/0.51

RD#sh in s0/0.51
Serial0/0.51 is up, line protocol is up
  Hardware is PowerQUICC Serial
  Description: === 1Mb pvc to RE (vc 92) ===
  Internet address is 10.1.1.74/30
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation FRAME-RELAY IETF
RD#sh ip route 95.74.216.238
% Network not in table

RE#sh ip eigrp top act
IP-EIGRP Topology Table for AS(1)/ID(10.1.1.65)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

A 20.1.1.1/32, 1 successors, FD is Inaccessible
    1 replies, active 00:01:56, query-origin: Multiple Origins, retries(1)
         via 10.1.1.74 (Infinity/Infinity), ATM4/0.92
         via 10.1.1.70 (Infinity/Infinity), ATM4/0.91, serno 11164925
         via 212.65.33.161 (Infinity/Infinity), ATM4/0.72, serno 11164926
         via 10.1.1.41 (Infinity/Infinity), ATM4/0.52, serno 11164924
         via 10.1.1.201 (Infinity/Infinity), ATM4/0.71, serno 11164923
         via 10.1.1.13 (Infinity/Infinity), rs, ATM4/0.51, serno 11165049
RE#sh ip route 20.1.1.1
Routing entry for 20.1.1.1/32
  Known via "eigrp 1", distance 170, metric 2181888, type external
  Redistributing via eigrp 1
  Last update from 10.1.1.74 on ATM4/0.92, 00:02:05 ago
  Routing Descriptor Blocks:
  * 10.1.1.74, from 10.1.1.74, 00:02:05 ago, via ATM4/0.92
      Route metric is 2181888, traffic share count is 1
      Total delay is 20470 microseconds, minimum bandwidth is 1544 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 3/255, Hops 4

RE#sh in atm4/0.51
ATM4/0.51 is up, line protocol is up
  Hardware is ENHANCED ATM PA
  Description: === pvc to RF (vc 51) ===
  Internet address is 10.1.1.14/30
  MTU 4470 bytes, BW 44209 Kbit, DLY 190 usec,
     reliability 255/255, txload 3/255, rxload 14/255
  Encapsulation ATM
  1398663875 packets input, 699290465460 bytes
  1691130801 packets output,208553257189 bytes
  679108 OAM cells input, 679105 OAM cells output
  AAL5 CRC errors : 0
  AAL5 SAR Timeouts : 0
  AAL5 Oversized SDUs : 0
RE#
Oct 2 12:58:28.709: %DUAL-5-NBRCHANGE: IP-EIGRP 1: Neighbor 10.1.1.13
(ATM4/0.51) is down: stuck in active
Oct 2 12:58:28.773: %DUAL-3-SIA: Route 20.1.1.1/32 stuck-in-active state in
IP-EIGRP 1. Cleaning up
Oct 2 12:58:29.345: %DUAL-5-NBRCHANGE: IP-EIGRP 1: Neighbor 10.1.1.13
(ATM4/0.51) is up: new adjacency

RF#sh ip eigrp top ac
IP-EIGRP Topology Table for AS(1)/ID(10.1.1.1)
RF#
RF#sh ip eigrp top ac
IP-EIGRP Topology Table for AS(1)/ID(10.1.1.1)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - Reply status

A 20.1.1.1/32, 1 successors, FD is Inaccessible
    1 replies, active 00:02:19, query-origin: Successor Origin
         via 10.1.1.14 (Infinity/Infinity), ATM1/1/0.51, serno 12833141
         via 10.1.1.6 (Infinity/Infinity), ATM5/1/0.1, serno 12833148
         via 10.1.1.193 (Infinity/Infinity), r, ATM1/1/0.60, serno 12833147
         via 10.1.1.157 (Infinity/Infinity), ATM1/1/0.53, serno 12833150
         via 10.1.1.149 (Infinity/Infinity), ATM1/1/0.54, serno 12833149
         via 212.65.33.177 (Infinity/Infinity), ATM1/1/0.71, serno 12833151
RF#sh ip route 20.1.1.1
Routing entry for 20.1.1.1/32
  Known via "eigrp 1", distance 170, metric 71936, type external
  Redistributing via eigrp 1, igrp 1
  Last update from 10.1.1.14 on ATM1/1/0.51, 00:02:26 ago
  Routing Descriptor Blocks:
  * 10.1.1.14, from 10.1.1.14, 00:02:26 ago, via ATM1/1/0.51
      Route metric is 71936, traffic share count is 1
      Total delay is 550 microseconds, minimum bandwidth is 44247 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 95/255, Hops 4

RF#sh in atm1/1/0.60
ATM1/1/0.60 is up, line protocol is up
  Hardware is cyBus ENHANCED ATM PA, address is 00d0.bc87.a828 (bia
00d0.bc87.a828)
  Description: === atm PVC5 from RF to RA ===
  Internet address is 10.1.1.194/30
  MTU 4470 bytes, BW 149760 Kbit, DLY 80 usec, rely 255/255, load 96/255
  Encapsulation ATM
  4447296 packets input, 730337537 bytes
  7998288 packets output,2427939136 bytes
  678787 OAM cells input, 678778 OAM cells output
  AAL5 CRC errors : 0
  AAL5 SAR Timeouts : 0
  AAL5 Oversized SDUs : 0

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