Hello.
I have a problem with counters on vlan and fastethernet interfaces. They very often display inexact values.
Test network draft below.
Network has three Cisco 1812 V03 routers. At laboratory i use IOS:
Cisco IOS Software, C181X Software (C181X-ADVENTERPRISEK9-M), Version
12.4(6)T2, RELEASE SOFTWARE (fc1)Test network scheme.
R1 R2 R3 FE0 192.168.5.1 192.168.5.2 - FE1 - 192.168.6.2 192.168.6.1 TUN10 192.168.10.1 - 192.168.10.2 VLAN100 192.168.100.1 - 192.168.200.1
Error description
When the network load is low, information about 5 minute input/output rate on interfaces are strange.
After high transfer between host, and after stop transmission, I see information like this below.
R3#sh interfaces vlan 100
Vlan100 is up, line protocol is up
Hardware is EtherSVI, address is 001b.5352.b702 (bia 001b.5352.b702)
Internet address is 192.168.200.1/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:15, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 68000 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 146885 packets input, 81350484 bytes, 0 no bufferReceived 114 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 146792 packets output, 6790236 bytes, 0 underruns 0 output errors, 1 interface resets 0 output buffer failures, 0 output buffers swapped outR3#sh interfaces fastEthernet 1
FastEthernet1 is up, line protocol is up
Hardware is PQ3_TSEC, address is 001b.5352.b703 (bia 001b.5352.b703)
Internet address is 192.168.6.1/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:04, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 56000 bits/sec, 0 packets/sec 175413 packets input, 18108992 bytesReceived 19143 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog 0 input packets with dribble condition detected 184109 packets output, 93094988 bytes, 0 underruns 0 output errors, 0 collisions, 3 interface resetsAfter low transfer between hosts, like ping between host I see information like this below.
R3#sh int vlan 100
Vlan100 is up, line protocol is up
Hardware is EtherSVI, address is 001b.5352.b702 (bia 001b.5352.b702)
Internet address is 192.168.200.1/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:10, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 1 packets/sec 5 minute output rate 0 bits/sec, 1 packets/sec 147027 packets input, 81367271 bytes, 0 no bufferReceived 209 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 146851 packets output, 6795538 bytes, 0 underruns 0 output errors, 1 interface resets 0 output buffer failures, 0 output buffers swapped outR1#sh int vlan 100
Vlan100 is up, line protocol is up
Hardware is EtherSVI, address is 001b.5352.b672 (bia 001b.5352.b672)
Internet address is 192.168.100.1/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:01:10, output never, output hang never
Last clearing of "show interface" counters 04:14:02
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 1 packets/sec 5 minute output rate 0 bits/sec, 1 packets/sec 963 packets input, 94935 bytes, 0 no bufferReceived 129 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 856 packets output, 61446 bytes, 0 underruns 0 output errors, 0 interface resets 0 output buffer failures, 0 output buffers swapped outConfiguration of test routers
!version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!hostname R1
!boot-start-marker
boot-end-marker
!enable secret 5 $1$dpdo$q6V4fLGEHI58Av2sOVhGl1
!no aaa new-model
!resource policy
!ip cef
no ip dhcp use vrf connected
!ip dhcp pool CIBOR
network 192.168.100.0 255.255.255.0
default-router 192.168.100.1
! !interface Tunnel10
ip address 192.168.10.1 255.255.255.0
tunnel source FastEthernet0
tunnel destination 192.168.6.1
!interface FastEthernet0
ip address 192.168.5.1 255.255.255.0
duplex auto
speed auto
!interface FastEthernet1
no ip address
shutdown
duplex auto
speed auto
!interface BRI0
no ip address
encapsulation hdlc
shutdown
!interface FastEthernet2
switchport access vlan 100
!interface FastEthernet3
switchport access vlan 100
!interface FastEthernet4
switchport access vlan 100
!interface FastEthernet5
switchport access vlan 100
!interface FastEthernet6
switchport access vlan 100
!interface FastEthernet7
switchport access vlan 100
!interface FastEthernet8
switchport access vlan 100
!interface FastEthernet9
!interface Vlan1
no ip address
!interface Vlan100
ip address 192.168.100.1 255.255.255.0
!router eigrp 100
passive-interface Vlan100
network 192.168.5.0
network 192.168.10.0
auto-summary
!ip route 192.168.200.0 255.255.255.0 192.168.10.2
! !no ip http server
no ip http secure-server
!control-plane
!banner motd _ *** R1 *** _
!line con 0
line aux 0
line vty 0 5
password qaz123
login
! !webvpn context Default_context
ssl authenticate verify all
!no inservice
!end
================================================= !
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!hostname R2
!boot-start-marker
boot-end-marker
!enable secret 5 $1$oHFJ$dvCocwbHro.cfW8wGo/g7/
!no aaa new-model
!resource policy
!ip cef
!interface FastEthernet0
ip address 192.168.5.2 255.255.255.0
duplex auto
speed auto
!interface FastEthernet1
ip address 192.168.6.2 255.255.255.0
duplex auto
speed auto
!interface BRI0
no ip address
encapsulation hdlc
shutdown
!interface FastEthernet2
switchport access vlan 50
!interface FastEthernet3
switchport access vlan 50
!interface FastEthernet4
switchport access vlan 50
!interface FastEthernet5
switchport access vlan 50
!interface FastEthernet6
switchport access vlan 50
!interface FastEthernet7
switchport access vlan 50
!interface FastEthernet8
switchport access vlan 50
!interface FastEthernet9
!interface Vlan1
no ip address
!interface Vlan100
no ip address
!router eigrp 100
network 192.168.5.0
network 192.168.6.0
auto-summary
!no ip http server
no ip http secure-server
!control-plane
!banner motd _ *** R2 *** _
!line con 0
line aux 0
line vty 0 5
password qaz123
login
! !webvpn context Default_context
ssl authenticate verify all
!no inservice
!end
================================================= !
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!hostname R3
!boot-start-marker
boot-end-marker
!enable secret 5 $1$Y4Jx$gB716CqmQreeUzWMbYXfI1
enable password line
!no aaa new-model
!resource policy
!ip cef
no ip dhcp use vrf connected
!ip dhcp pool CIBOR
network 192.168.200.0 255.255.255.0
default-router 192.168.200.1
!interface Tunnel10
ip address 192.168.10.2 255.255.255.0
tunnel source FastEthernet1
tunnel destination 192.168.5.1
!interface FastEthernet0
no ip address
shutdown
duplex auto
speed auto
!interface FastEthernet1
ip address 192.168.6.1 255.255.255.0
duplex auto
speed auto
!interface BRI0
no ip address
encapsulation hdlc
shutdown
!interface FastEthernet2
switchport access vlan 100
!interface FastEthernet3
switchport access vlan 100
!interface FastEthernet4
switchport access vlan 100
!interface FastEthernet5
switchport access vlan 100
!interface FastEthernet6
switchport access vlan 100
!interface FastEthernet7
switchport access vlan 100
!interface FastEthernet8
switchport access vlan 100
!interface FastEthernet9
!interface Vlan1
no ip address
!interface Vlan100
ip address 192.168.200.1 255.255.255.0
!router eigrp 100
passive-interface Vlan100
network 192.168.6.0
network 192.168.10.0
auto-summary
!ip route 192.168.100.0 255.255.255.0 192.168.10.1
! !no ip http server
no ip http secure-server
!control-plane
!banner motd _ *** R3 *** _
!line con 0
line aux 0
line vty 0 5
password qaz123
login
! !webvpn context Default_context
ssl authenticate verify all
!no inservice
!end
Please help me to solve my problem
Regards
Przemek Ciborowski.