[c-nsp] ICMP Query : Duplicate Reply

Gangasagar Amula sagar_cisco at rediffmail.com
Sat Mar 18 01:56:30 EST 2006


Hi All,

Scenario:
The below output was captured when we are pinging from one vlan to other vlan.
We have 4006 Switch involved in between.

---------------------------------------------------------------- 
64 bytes from 10.176.0.51: icmp_seq=6 ttl=127 time=26.7 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=7 ttl=127 time=11.1 ms
64 bytes from 10.176.0.51: icmp_seq=7 ttl=127 time=11.2 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=7 ttl=127 time=11.6 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=7 ttl=127 time=11.6 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=7 ttl=127 time=12.0 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=7 ttl=127 time=12.1 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=8 ttl=127 time=5.23 ms
64 bytes from 10.176.0.51: icmp_seq=8 ttl=127 time=5.28 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=8 ttl=127 time=5.86 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=8 ttl=127 time=5.91 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=8 ttl=127 time=6.34 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=8 ttl=127 time=6.39 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=9 ttl=127 time=2.61 ms
64 bytes from 10.176.0.51: icmp_seq=9 ttl=127 time=2.66 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=9 ttl=127 time=3.06 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=9 ttl=127 time=3.12 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=9 ttl=127 time=3.51 ms (DUP!)
64 bytes from 10.176.0.51: icmp_seq=9 ttl=127 time=3.57 ms (DUP!)
-------------------------------------------------------------------

Work around Tried:

We have taken a router with two ethernet ports and have attached one machine to each port////asigning same ips as it was in above scenario.///
So on pinging we got a normal reply. That is single reply single query..No duplication.


Is it something related to Switch which is throwing same packet twice/thrice...

----------------------------- Switch Ver and Config ------------------

****************** show version ******************

WS-C4006 Software, Version NmpSW: 6.4(15)
Copyright (c) 1995-2005 by Cisco Systems, Inc.
NMP S/W compiled on Jan  6 2005, 12:55:47
GSP S/W compiled on Jan 06 2005, 10:54:00

System Bootstrap Version: 5.4(1)

Hardware Version: 1.3  Model: WS-C4006  Serial #: FOX05025207

Mod Port Model      Serial #              Versions
--- ---- ---------- -------------------- ---------------------------------
1   2    WS-X4013   JAB050609AU          Hw : 1.3
                                         Gsp: 6.4(15.0)
                                         Nmp: 6.4(15)
2   48   WS-X4148-RJ JAE045003U3          Hw : 2.3
3   48   WS-X4148-RJ JAE0450038T          Hw : 2.3
4   48   WS-X4148-RJ JAE045003GD          Hw : 2.3
5   48   WS-X4148-RJ JAE044801V8          Hw : 2.3
6   34   WS-X4232-L3 JAB044601ST          Hw : 1.5

       DRAM                    FLASH                   NVRAM
Module Total   Used    Free    Total   Used    Free    Total Used  Free
------ ------- ------- ------- ------- ------- ------- ----- ----- -----
1       65536K  35911K  29625K  16384K   9138K   7246K  480K  280K  200K

Uptime is 145 days, 12 hours, 23 minutes


****************** show config ******************

This command shows non-default configurations only.
Use 'show config all' to show both default and non-default configurations.
..............
..................
..................
..................
..................
..................
..................
..

begin
!
# ***** NON-DEFAULT CONFIGURATION *****
!
!
#time: Fri Mar 17 2006, 19:00:35 
!
#version 6.4(15)
!
!
#system web interface version(s)
set password ********
set enablepass ********
set prompt HSL4006SW1
set banner motd ^C



HSL4006SW (Catalyst 4006)
Access Restricted    ^C
!
#test
!
#system
set system name  HSL4006SW1
set system location HSL TradeWorld
set system contact  wipro.helpdesk at hdfcsec.com
!
#frame distribution method
set port channel all distribution mac both
!
#snmp
set snmp community read-only      ********
set snmp community read-write     ********
set snmp community read-write-all ********
!
#vtp
set vtp domain HSL
set vlan 1 name default type ethernet mtu 1500 said 100001 state active 
set vlan 40 name Bloomberg type ethernet mtu 1500 said 100040 state active 
set vlan 50 name BSE type ethernet mtu 1500 said 100050 state active 
set vlan 70 name BSE_VSAT type ethernet mtu 1500 said 100070 state active 
set vlan 80 name BSE_VSAT1 type ethernet mtu 1500 said 100080 state active 
set vlan 90 name BSE_VSAT2 type ethernet mtu 1500 said 100090 state active 
set vlan 100 name SWMGMT type ethernet mtu 1500 said 100100 state active 
set vlan 1002 name fddi-default type fddi mtu 1500 said 101002 state active 
set vlan 1004 name fddinet-default type fddinet mtu 1500 said 101004 state activ
e stp ieee 
set vlan 1005 name trnet-default type trbrf mtu 1500 said 101005 state active st
p ibm 
set vlan 60,99
set vlan 1003 name token-ring-default type trcrf mtu 1500 said 101003 state acti
ve mode srb aremaxhop 7 stemaxhop 7 backupcrf off 
!
#ip
set interface sc0 1 10.176.4.18/255.255.252.0 10.176.7.255

set interface sl0 down
set interface me1 down
set ip redirect   disable
set ip route 0.0.0.0/0.0.0.0         10.176.4.1     
set ip alias default         0.0.0.0
!
#spantree
#vlan parameters             
set spantree priority 28100  1
!
#syslog
set logging console disable
set logging server 10.176.4.250
set logging server facility LOCAL5
set logging server severity 5
set logging buffer 400
!
#ntp
set ntp client enable
!
#set boot command
set boot config-register 0x2
set boot system flash bootflash:cat4000.6-4-15.bin
!
#permit list
set ip permit 10.176.4.250 
!
#port channel
set port channel 6/3-4 468
set port channel 5/25-30 477
set port channel 5/31-38 478
set port channel 5/39-45 479
set port channel 5/46-48 480
set port channel 6/1-2 481
!
#module 1 : 2-port 1000BaseX Supervisor
set module name    1    Supervisor Module
set udld enable 1/1 
clear trunk 1/1  10
set trunk 1/1  auto dot1q 1-9,11-1005
!
#module 2 : 48-port 10/100BaseTx Ethernet
set module name    2    HSL-LAN Connections
set vlan 50   2/36
set vlan 60   2/7,2/12,2/24,2/26,2/32-34,2/37-40,2/42,2/44-48
set vlan 80   2/9-10,2/25
set port speed      2/11-12,2/31,2/35,2/40,2/44  100
set port duplex     2/11-12,2/31,2/35,2/40,2/44  full
set port name       2/12 connected to HSLKAM
set port name       2/25 Link to bsevsat80IDU
set port name       2/31 *Trunk to HSLSW2*
set port name       2/35 *Uplinkto SERVERSW2*
set port name       2/39 Con. to NSE Vlan SW
set port name       2/44 *Trunk BSE_SWITCH*
set trunk 2/31 on dot1q 1-1005
set trunk 2/35 off dot1q 1-1005
set trunk 2/39 off dot1q 1-1005
!
#module 3 : 48-port 10/100BaseTx Ethernet
set module name    3    HSL-LAN Connections
set vlan 40   3/21-22,3/24
set vlan 50   3/13,3/15,3/19,3/23,3/39
set vlan 60   3/4,3/18,3/27,3/31,3/43,3/47
set vlan 70   3/2,3/14
set vlan 80   3/20
set port speed      3/40  100
set port duplex     3/40  full
set port name       3/16 * To Printer Room *
set port name       3/32 Dlink OPS Switch
set trunk 3/2  off dot1q 1-1005
!
#module 4 : 48-port 10/100BaseTx Ethernet
set module name    4    HSL_LAN Connections
set vlan 50   4/43
set vlan 60   4/12,4/27,4/32,4/34,4/36-37,4/40-41,4/44-45
set vlan 70   4/1,4/38
set vlan 90   4/46
set port speed      4/7  100
set port duplex     4/7  full
set port name       4/1  Link to bsevsat70IDU
set trunk 4/7  off dot1q 1-1005
!
#module 5 : 48-port 10/100BaseTx Ethernet
set module name    5    HSL_LAN Connections
set vlan 50   5/3,5/34
set vlan 60   5/12-14,5/16-17,5/30
set vlan 70   5/38
set vlan 90   5/37
!
#module 6 : 34-port Router Switch Card
set module name    6    HSL-LAN Connections
set vlan 50   6/34
set vlan 60   6/6,6/8,6/13,6/28,6/31
set vlan 99   6/1-2
set port speed      6/16,6/29,6/31  100
set port duplex     6/16,6/29,6/31  full
set port name       6/1  GEC 802.1Q trunk
set port name       6/2  GEC 802.1Q trunk
set port name       6/16 Link to SERVER-SW1
set trunk 6/1  nonegotiate dot1q 1-1005
set trunk 6/2  nonegotiate dot1q 1-1005
clear trunk 6/3  1-1005
set trunk 6/3  auto dot1q 
clear trunk 6/4  1-1005
set trunk 6/4  auto dot1q 
set trunk 6/16 off dot1q 1-1005
set spantree portfast    6/3-15,6/17-18 enable
set port channel 6/1-2 mode on
end

****************** show proc cpu ******************


CPU utilization for five seconds:  85.63%
                      one minute:  77.70%
                    five minutes:  75.19%

PID Runtime(ms) Invoked    uSecs    5Sec    1Min    5Min    TTY Process
--- ----------- ---------- -------- ------- ------- ------- --- ---------------
1   1174535890  0          0         14.37%  22.30%  24.81% -2  Kernel and Idle
2   11          127        1000       0.00%   0.00%   0.00% -2  Flash MIB Updat
3   110027177   116603290  75000      0.59%   0.92%   0.98% -2  SynConfig      
4   22713113    16282080   5000       0.49%   0.00%   0.00% -2  Statuspoll     
5   3144222     39615783   2000       0.19%   0.00%   0.00% -2  PwrDevMsgUpd   
6   199666      2504869    1000       0.00%   0.00%   0.00% -2  StatusPoll 5s  
7   1449497     4558       71000     18.71%  11.38%   7.80% 1084614932 show_comm
and   
8   9           2          9000       0.00%   0.00%   0.00% -2  SecurityRx     
9   51924       523415     1000       0.00%   0.00%   0.00% -2  SWPoll64bCnt   
10  868750      12223525   2000       0.19%   0.00%   0.00% -2  Earl           
11  97628       1254856    2000       0.00%   0.00%   0.00% -2  ProtocolFilter 
12  310         400        2000       0.00%   0.00%   0.00% -2  connecthelper  
13  94          321        1000       0.00%   0.00%   0.00% -2  telnetd        
14  23002097    108625901  13000      0.68%   0.00%   0.00% -2  ProtocolTimer  
15  1           1          1000       0.00%   0.00%   0.00% -2  RMON AlarmTimer
16  0           1          0          0.00%   0.00%   0.00% -2  llcSSTPFlood   
17  138672492   2496733069 2000       0.53%   0.00%   0.00% -2  gsgScpAggregati
18  23          145        1000       0.00%   0.00%   0.00% -2  sntp_recd      
19  0           1          0          0.00%   0.00%   0.00% -2  sntp_xmitd     
20  796454      1342840    2000       0.00%   0.00%   0.00% -2  cdpd           
21  97080483    12531477   100000     1.36%   1.00%   1.00% -2  cdpdtimer      
22  19947258    12417928   11000      0.68%   0.00%   0.00% -2  SptTimer       
23  121654340   68317547   32000      1.43%   1.00%   1.00% -2  SptBpduRx      
24  106482592   12588072   34000      1.19%   1.00%   1.00% -2  SptBpduTx      
25  1331327     12261017   2000       0.00%   0.00%   0.00% -2  VtpTimer       
26  25625032    10235686   32000      0.41%   0.00%   0.00% -2  DTP_Rx         
27  161683      274383     26000      0.00%   0.00%   0.00% -2  EthChnlRx      
28  252470      404377     27000      0.00%   0.00%   0.00% -2  EthChnlConfig  
29  7900873     111357253  2000       0.76%   0.00%   0.00% -2  sptHelper      
30  0           1          0          0.00%   0.00%   0.00% -2  sptTraps       
31  92194       1254861    2000       0.19%   0.00%   0.00% -2  ciscoRmonTimer 
32  83884       1254859    1000       0.00%   0.00%   0.00% -2  ciscoUsrHistory
33  1           1          1000       0.00%   0.00%   0.00% -2  rmonMediaIndep 
34  2           8          1000       0.00%   0.00%   0.00% -2  SnmpTraps      
35  0           1          0          0.00%   0.00%   0.00% -2  Acct Send Bkg  
38  53          9          9000       0.00%   0.00%   0.00% -2  l2t_server     
40  10873       103545     6000       0.00%   0.00%   0.00% -2  SysLogTask     
41  834599      12220730   2000       0.19%   0.00%   0.00% -2  pinggateA      
42  54103676    746014533  2000       0.87%   0.00%   0.00% -2  Authenticator_S
43  1           1          1000       0.00%   0.00%   0.00% -2  dot1x_rx       
44  1753130     26497140   2000       0.00%   0.00%   0.00% -2  Backend_Rx     
45  57038095    626675562  2000       0.68%   0.00%   0.00% -2  Backend_SM     
143 201145347   2496733059 3000       0.41%   0.92%   0.98% 0   Console        
144 246459      1123421    199000     0.00%   0.00%   0.00% -2  snmpdm         
145 27775       166799     3000       0.00%   0.00%   0.00% -2  VtpRx          
146 532312      244762     52000      0.00%   0.00%   0.00% -2  THREAD         
147 225266      112        4000       0.00%   0.00%   0.00% 1084614932 telnet147
      
193 3234873477  2059011136 17684     44.20%  44.13%  43.53% 0   Packet forwardi
194 538929086   250881678  9209       5.43%   5.73%   6.21% 0   Switching overh
195 785169361   656370151  23018      6.97%   6.82%   6.75% 0   Admin overhead 

--------------------------- L3 MODULE Config -------------------------

------------------ show version ------------------

Cisco Internetwork Operating System Software 
IOS (tm) L3 Switch/Router Software (CAT4232-IN-M), Version 12.0(10)W5(18f)  RELE
ASE SOFTWARE 
Copyright (c) 1986-2000 by cisco Systems, Inc.
Compiled Mon 04-Dec-00 22:07 by integ
Image text-base: 0x60010928, data-base: 0x605F6000

ROM: System Bootstrap, Version 12.0(7)W5(15b) RELEASE SOFTWARE 

SW4006-RSM uptime is 3 weeks, 22 hours, 6 minutes
System restarted by power-on at 20:55:36 UTC Thu Feb 23 2006
Running default software

cisco Cat4232L3 (R5000) processor with 57344K/8192K bytes of memory.
R5000 processor, Implementation 35, Revision 2.1
Last reset from power-on
1 FastEthernet/IEEE 802.3 interface(s)
4 Gigabit Ethernet/IEEE 802.3z interface(s)
123K bytes of non-volatile configuration memory.

16384K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2

------------------ show running-config ------------------


Building configuration...

Current configuration:
!
! Last configuration change at 12:44:07 UTC Fri Mar 17 2006
! NVRAM config last updated at 12:58:25 UTC Thu Mar 9 2006
!
version 12.0
no service pad
service timestamps debug datetime localtime
service timestamps log datetime localtime
service password-encryption
!
hostname SW4006-RSM
!
logging buffered 40000 debugging
enable secret 5 <removed>
!
ip subnet-zero
no ip domain-lookup
!
!
!
interface Port-channel1
 no ip address
 no ip redirects
 no ip directed-broadcast
 no ip mroute-cache
 load-interval 30
!
interface Port-channel1.1
 encapsulation dot1Q 1
 ip address 10.176.4.8 255.255.252.0
 no ip redirects
 no ip directed-broadcast
 no ip mroute-cache
 no cdp enable
!
interface Port-channel1.60
 encapsulation dot1Q 60
 ip address 10.176.0.1 255.255.252.0
 ip access-group UDP in
 ip helper-address 10.176.19.255
 ip helper-address 10.192.7.255
 ip helper-address 10.196.7.255
 ip helper-address 10.188.4.31
 ip helper-address 10.184.7.255
 ip helper-address 10.180.7.255
 ip helper-address 10.200.7.255
 ip helper-address 10.176.43.255
 ip helper-address 10.176.31.255
 ip helper-address 10.176.23.255
 ip helper-address 10.176.47.255
 ip helper-address 10.176.15.255
 no ip redirects
 ip directed-broadcast
 no ip mroute-cache
 no cdp enable
!
interface Port-channel1.99
 encapsulation dot1Q 99 native
 no ip redirects
 no ip directed-broadcast
 no ip mroute-cache
 no cdp enable
!
interface FastEthernet1
 no ip address
 no ip directed-broadcast
 shutdown
 no cdp enable
!
interface GigabitEthernet1
 no ip address
 no ip redirects
 no ip directed-broadcast
 shutdown
 no cdp enable
!
interface GigabitEthernet2
 no ip address
 no ip redirects
 no ip directed-broadcast
 shutdown
 no cdp enable
!
interface GigabitEthernet3
 no ip address
 no ip redirects
 no ip directed-broadcast
 no ip mroute-cache
 load-interval 30
 no negotiation auto
 channel-group 1
!
interface GigabitEthernet4
 no ip address
 no ip redirects
 no ip directed-broadcast
 no ip mroute-cache
 load-interval 30
 no negotiation auto
 channel-group 1
!
ip classless
ip forward-protocol udp 8010
ip forward-protocol udp 8012
ip forward-protocol udp 9004
ip forward-protocol udp 8015
ip forward-protocol udp 8019
ip forward-protocol udp 9010
ip forward-protocol udp 9903
ip forward-protocol udp 5019
ip forward-protocol udp 7019
ip route 10.7.86.0 255.255.255.0 10.176.0.3
ip route 10.7.87.0 255.255.255.0 10.176.0.3
ip route 10.7.88.0 255.255.255.0 10.176.0.3
ip route 10.7.191.0 255.255.255.0 10.176.0.3
ip route 10.88.1.0 255.255.255.0 10.176.0.3
ip route 10.176.12.0 255.255.252.0 10.176.0.2
ip route 10.176.16.0 255.255.252.0 10.176.0.2
ip route 10.176.20.0 255.255.252.0 10.176.4.1
ip route 10.176.28.0 255.255.252.0 10.176.4.1
ip route 10.176.40.0 255.255.252.0 10.176.0.2
ip route 10.176.44.0 255.255.252.0 10.176.0.2
ip route 10.180.4.0 255.255.252.0 10.176.0.2
ip route 10.184.4.0 255.255.252.0 10.176.0.2
ip route 10.188.4.0 255.255.255.224 10.176.0.2
ip route 10.192.4.0 255.255.252.0 10.176.0.2
ip route 10.196.4.0 255.255.252.0 10.176.0.2
ip route 10.200.4.0 255.255.252.0 10.176.0.2
ip route 10.250.50.28 255.255.255.252 10.176.0.2
ip route 10.250.50.32 255.255.255.252 10.176.0.2
ip route 10.250.50.36 255.255.255.252 10.176.0.2
ip route 10.250.50.40 255.255.255.252 10.176.0.2
ip route 10.250.50.44 255.255.255.252 10.176.0.2
ip route 10.250.50.52 255.255.255.252 10.176.0.2
ip route 61.95.226.99 255.255.255.255 10.176.4.2
ip route 172.16.1.0 255.255.255.0 10.176.4.2
ip route 192.168.172.24 255.255.255.255 10.176.4.24
ip route 192.168.172.25 255.255.255.255 10.176.0.25
ip route 192.168.172.96 255.255.255.255 10.176.0.96
ip route 192.168.172.170 255.255.255.255 10.176.4.170
ip route 202.44.137.3 255.255.255.255 10.176.4.2
ip route 203.199.21.21 255.255.255.255 10.176.4.2
ip route 203.199.87.140 255.255.255.255 10.176.4.2
!
!
ip access-list extended UDP
 permit ip host 10.176.0.25 any
 permit ip host 10.176.0.26 any
 deny   udp any any
 permit ip any any
ip access-list extended icmp
 permit icmp any any log
 permit ip any any
no logging trap
no cdp run
snmp-server community <removed> RO
!


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