what is the feature of IOS on ISRg2 that automatic create tunnel0 when "show ip int brief"
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01-18-2011 07:55 PM - edited 03-04-2019 11:07 AM
I got question from my customer that he configure ISRg2, when he try "show ip int brief", he see that router has tunnel0 and use same IP address as Gi0.
#sh ip int brief
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 10.88.2.1 YES NVRAM up up
GigabitEthernet0/1 10.188.2.1 YES NVRAM up up
Serial0/0/0 172.29.88.88 YES NVRAM up up
Serial0/0/1 unassigned YES NVRAM administratively down down
Tunnel0 10.88.2.1 YES unset up up
He send "show run" that haven't any config about tunnel0. I would like to know what is tunnel0 for? And does it effect to any operate of router or not.
sh ver
Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.1(2)T2, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Sat 23-Oct-10 01:25 by prod_rel_team
ROM: System Bootstrap, Version 15.0(1r)M9, RELEASE SOFTWARE (fc1)
uptime is 19 hours, 52 minutes
System returned to ROM by power-on
System restarted at 20:37:22 GMT+7 Wed Jan 5 2011
System image file is "flash0:c2900-universalk9-mz.SPA.151-2.T2.bin"
Last reload type: Normal Reload
This product contains cryptographic features and is subject to United
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If you require further assistance please contact us by sending email to
Cisco CISCO2901/K9 (revision 1.0) with 475136K/49152K bytes of memory.
Processor board ID FHK1446737G
2 Gigabit Ethernet interfaces
2 Serial(sync/async) interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
255K bytes of non-volatile configuration memory.
254464K bytes of ATA System CompactFlash 0 (Read/Write)
License Info:
License UDI:
-------------------------------------------------
Device# PID SN
-------------------------------------------------
*0 CISCO2901/K9
Technology Package License Information for Module:'c2900'
----------------------------------------------------------------
Technology Technology-package Technology-package
Current Type Next reboot
-----------------------------------------------------------------
ipbase ipbasek9 Permanent ipbasek9
security securityk9 Permanent securityk9
uc None None None
data datak9 Permanent datak9
Configuration register is 0x2102
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01-18-2011 09:53 PM
It depends, why dont you share the show running
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01-18-2011 10:17 PM
This is "show run" from my customer. I remove some line about description, username and serial number
Current configuration : 5882 bytes
!
! Last configuration change at 16:11:42 GMT+7 Thu Jan 6 2011 by jiruttaphol
! NVRAM config last updated at 21:45:39 GMT+7 Wed Jan 5 2011 by jiruttaphol
!
version 15.1
service timestamps debug datetime msec localtime
service timestamps log datetime msec localtime
service password-encryption
!
hostname ABC!
boot-start-marker
boot-end-marker
!
!
logging buffered 40960
no logging monitor
!
no aaa new-model
!
memory-size iomem 10
clock timezone GMT+7 7 0
!
no ipv6 cef
ip source-route
ip cef
!
!
!
ip multicast-routing
!
!
no ip domain lookup
!
multilink bundle-name authenticated
!
decnet routing 12.288
decnet node-type routing-iv
!
!
!
crypto pki token default removal timeout 0
!
crypto pki trustpoint TP-self-signed-3985897665
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-3985897665
revocation-check none
!
!
crypto pki certificate chain TP-self-signed-3985897665
certificate self-signed 01
3082023F 308201A8 A0030201 02020101 300D0609 2A864886 F70D0101 04050030
31312F30 2D060355 04031326 494F532D 53656C66 2D536967 6E65642D 43657274
69666963 6174652D 33393835 38393736 3635301E 170D3131 30313035 31333338
35315A17 0D323030 31303130 30303030 305A3031 312F302D 06035504 03132649
4F532D53 656C662D 5369676E 65642D43 65727469 66696361 74652D33 39383538
39373636 3530819F 300D0609 2A864886 F70D0101 01050003 818D0030 81890281
81009A92 0FE6D97D 89B87C67 49EBE78A 1A752AF1 3E40A514 2086D6CF A571CC2A
4A4E21FD 4FDC495F 9F252B9B D8AD98EB 612E3A49 24C4E2CE 350AFD4C 07A95B17
54F192FE 261F372D 8A64B630 B1BD9E87 44C14497 72C43526 46803778 1581745E
1AEEC453 AD5C74C5 CCF8E64C C44F081D B7ACD1EE 0D37B441 AC0F480A 2DDEEDD5
645B0203 010001A3 67306530 0F060355 1D130101 FF040530 030101FF 30120603
551D1104 0B300982 07445055 5F525431 301F0603 551D2304 18301680 14C97B60
41D4C892 9604D5BD FC7C4D21 D3C6D45A F1301D06 03551D0E 04160414 C97B6041
D4C89296 04D5BDFC 7C4D21D3 C6D45AF1 300D0609 2A864886 F70D0101 04050003
81810018 8DA44803 DC0BD861 28EE66AF 3CBFD661 F027AE06 63F318FC 42363BFD
DEDB8418 207CCD38 2CE07E12 A2ABBF3B 4031B80E 4B6AA922 21DC4501 6CB9806F
26E89356 96972CB5 7005119B E4D90418 0C50F421 2FB5CC63 4BE71555 35CB8F3C
C774BCEE BDE71E43 2D918AA4 54B0D706 4223C004 4BCC6D22 ECDFB5AE 4C0F5994 090194
quit
license udi pid CISCO2901/K9 sn xxxx
!
!
redundancy
!
!
!
!
!
track 1 interface Serial0/0/0 line-protocol
!
!
!
!
!
!
!
interface GigabitEthernet0/0
ip address 10.88.2.1 255.255.0.0
no ip redirects
ip pim sparse-dense-mode
ip ospf cost 80
load-interval 30
duplex auto
speed auto
standby use-bia
standby 0 ip 10.88.2.254
standby 0 preempt
standby 0 track 1 decrement 10
!
interface GigabitEthernet0/1
ip address 10.188.2.1 255.255.0.0
no ip redirects
ip pim sparse-dense-mode
ip ospf cost 180
duplex auto
speed auto
standby 2 ip 10.188.2.254
standby 2 priority 95
standby 2 preempt
standby 2 track 1 decrement 10
!
interface Serial0/0/0
bandwidth 128
ip address 172.29.88.88 255.255.255.0
ip accounting output-packets
ip pim sparse-dense-mode
ip ospf cost 310
load-interval 30
decnet cost 10
priority-group 10
keepalive 5
!
interface Serial0/0/1
no ip address
shutdown
clock rate 2000000
!
!
router ospf 100
network 10.88.0.0 0.0.255.255 area 88
network 10.188.0.0 0.0.255.255 area 88
network 172.29.88.0 0.0.0.255 area 88
!
no ip forward-protocol nd
!
no ip http server
ip http authentication local
ip http secure-server
ip http timeout-policy idle 5 life 86400 requests 10000
!
ip route 172.17.0.0 255.255.0.0 172.29.188.20
ip route 172.17.0.0 255.255.0.0 172.29.88.1 20
ip route 172.19.0.0 255.255.255.0 172.29.88.20
ip route 172.19.0.0 255.255.255.0 172.29.88.1 20
ip route 192.168.223.0 255.255.255.0 172.29.88.20
ip route 192.168.223.0 255.255.255.0 172.29.88.1 20
ip route 192.168.224.0 255.255.255.0 172.29.188.20
ip route 192.168.224.0 255.255.255.0 172.29.88.1 20
ip route 192.168.225.0 255.255.255.0 172.29.188.20
ip route 192.168.225.0 255.255.255.0 172.29.88.1 20
!
logging esm config
logging 172.16.10.166
priority-list 10 protocol decnet high
priority-list 10 protocol ip high list 191
priority-list 10 protocol ip medium list 192
priority-list 10 protocol ip normal list 193
priority-list 10 protocol ip medium
priority-list 10 default low
!
!
!
!
!
!
snmp-server engineID local 800000092300000B5F430460
snmp-server community XX RO
snmp-server enable traps tty
!
control-plane
!
!
line con 0
logging synchronous
login local
line aux 0
logging synchronous
modem InOut
no exec
transport preferred telnet
transport input all
escape-character NONE
stopbits 1
speed 19200
line vty 0 4
exec-timeout 0 0
privilege level 15
logging synchronous
login local
transport input telnet ssh
line vty 5 15
privilege level 15
logging synchronous
login local
transport input telnet ssh
!
scheduler allocate 20000 1000
ntp server 172.16.10.166 prefer
end
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01-18-2011 10:58 PM
Hello,
I am not sure but this happens when you enable pim multicast. Can you confirm the output of "sh ip pim neighbor" contain this
tunnel0 as an interface
Regards
Mahesh
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01-18-2011 11:07 PM
its because IP Multicast Sparse Mode
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01-18-2011 11:09 PM
You can verify it from show int tunnel0
it will show it as Tunnel protocol/transport PIM/IPv4.
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01-18-2011 11:23 PM
Thank you for your answer, I will check with my customer.
