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 buffer
Received 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 out
R3#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 bytes
Received 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 resets
After 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 buffer
Received 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 out
R1#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 buffer
Received 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 out
Configuration 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.