[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.
..............
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..................
..................
..................
..................
..................
..
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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