01-12-2012 10:45 PM - edited 03-07-2019 04:19 AM
Hello
Cisco 1812, Version 12.3(8)YI1
router#sh mac-address-table | i 0470
0017.a477.0470 Dynamic 813 none
What does "none" mean ?
Most of mac adressess in cam has specified interface, but several has none....
Thanx
01-12-2012 10:54 PM
Hi,
Would you mind posting the complete output, or at least its heading? The table has its columns named; in this output, it is not clear what is expressed by a particular column.
Best regards,
Peter
01-12-2012 11:00 PM
ok, here is the first part of output:
router#sh mac-address-table
Destination Address Address Type VLAN Destination Port
------------------- ------------ ---- --------------------
0001.c709.8bfb Dynamic 1 FastEthernet5
0004.dd31.f958 Dynamic 1 FastEthernet5
0004.dd85.6930 Dynamic 1 FastEthernet4
0014.a817.ba1c Self 1 Vlan1
0018.19c8.e858 Dynamic 1 FastEthernet8
0004.dd31.f958 Dynamic 702 FastEthernet5
0001.c709.8bff Dynamic 730 FastEthernet5
0002.4bf8.5e00 Dynamic 730 FastEthernet5
0002.b3f4.00f4 Dynamic 730 FastEthernet5
0002.b903.0100 Dynamic 730 FastEthernet7
0002.b903.0104 Dynamic 730 FastEthernet7
0002.b927.1e40 Dynamic 730 FastEthernet5
0002.ba13.63ff Dynamic 730 FastEthernet5
0003.4732.ed58 Dynamic 730 FastEthernet7
0004.6ef0.4fff Dynamic 730 FastEthernet5
0004.dd31.f958 Dynamic 730 FastEthernet5
0005.ddb5.3fff Dynamic 730 FastEthernet5
0006.d680.37ff Dynamic 730 FastEthernet5
000d.6046.dd99 Dynamic 730 FastEthernet5
000d.6046.ddcd Dynamic 730 FastEthernet5
000d.6046.df85 Dynamic 730 FastEthernet5
000d.6046.dfcd Dynamic 730 FastEthernet5
000d.6046.e052 Dynamic 730 FastEthernet5
000d.6046.e102 Dynamic 730 FastEthernet5
000d.6046.e1a7 Dynamic 730 FastEthernet5
000d.6047.2363 Dynamic 730 FastEthernet5
000d.6047.bc51 Dynamic 730 FastEthernet5
000d.6047.bee3 Dynamic 730 FastEthernet5
000d.6047.d85b Dynamic 730 FastEthernet5
000d.6047.dbbf Dynamic 730 FastEthernet5
000d.6047.dbd0 Dynamic 730 FastEthernet5
000d.6047.e819 Dynamic 730 FastEthernet5
0014.5ecf.2982 Dynamic 730 FastEthernet8
0014.5ecf.42fe Dynamic 730 FastEthernet5
0014.5ecf.7eb8 Dynamic 730 FastEthernet5
0014.5ecf.860c Dynamic 730 FastEthernet5
0014.5ecf.d2c0 Dynamic 730 FastEthernet5
0014.5ecf.e457 Dynamic 730 FastEthernet5
0014.5ecf.e461 Dynamic 730 FastEthernet5
0014.a817.ba1c Dynamic 730 Vlan730
0018.19c8.e858 Dynamic 730 FastEthernet8
0018.8b39.8a58 Dynamic 730 FastEthernet5
0018.8b3a.3ce2 Dynamic 730 FastEthernet5
0018.8b3a.3d0c Dynamic 730 FastEthernet5
0018.8b3b.5d77 Dynamic 730 FastEthernet5
0018.8b40.2972 Dynamic 730 FastEthernet5
0018.8b40.2b35 Dynamic 730 FastEthernet5
0018.8b4b.5ba7 Dynamic 730 FastEthernet5
0018.8b51.ba57 Dynamic 730 FastEthernet5
0018.8b51.ba63 Dynamic 730 FastEthernet5
0018.8b51.bb1b Dynamic 730 FastEthernet5
0019.b9b4.0dac Dynamic 730 FastEthernet5
0019.b9ca.beac Dynamic 730 FastEthernet5
0019.e254.21c2 Dynamic 730 FastEthernet5
001a.6481.70c5 Dynamic 730 FastEthernet8
001c.23d9.4535 Dynamic 730 FastEthernet5
001e.4f16.06b3 Dynamic 730 FastEthernet5
001e.4f16.06b7 Dynamic 730 FastEthernet5
001e.4f16.06c9 Dynamic 730 FastEthernet5
001e.4f16.0a6f Dynamic 730 FastEthernet5
001e.4f16.0abd Dynamic 730 FastEthernet5
001e.4f16.0ad1 Dynamic 730 FastEthernet5
001e.4f16.235f Dynamic 730 FastEthernet5
001e.4f16.2381 Dynamic 730 FastEthernet5
001e.4f16.23bf Dynamic 730 FastEthernet5
001e.4f16.2678 Dynamic 730 FastEthernet5
001e.4f16.267c Dynamic 730 FastEthernet5
001e.4f16.2a0f Dynamic 730 FastEthernet5
001e.4f16.2a17 Dynamic 730 FastEthernet5
001e.4f2a.c3db Dynamic 730 FastEthernet5
001e.4f31.33da Dynamic 730 FastEthernet5
001e.4f31.365c Dynamic 730 FastEthernet5
001f.6c03.4140 Dynamic 730 FastEthernet5
001f.6c7b.5a40 Dynamic 730 FastEthernet5
0021.5e2a.416f Dynamic 730 FastEthernet5
0021.5e2a.46db Dynamic 730 FastEthernet5
0022.1984.a859 Dynamic 730 FastEthernet5
0022.1984.a875 Dynamic 730 FastEthernet5
0022.1991.1444 Dynamic 730 FastEthernet5
0022.1998.472b Dynamic 730 FastEthernet5
0024.e856.0234 Dynamic 730 FastEthernet5
0024.e881.158f Dynamic 730 FastEthernet5
0026.b950.9f45 Dynamic 730 FastEthernet5
0030.4894.ebd1 Dynamic 730 FastEthernet4
0030.7814.f7ff Dynamic 730 FastEthernet5
2c6b.f584.1fc2 Dynamic 730 FastEthernet5
a4ba.db16.216a Dynamic 730 FastEthernet5
a4ba.db1b.55e9 Dynamic 730 FastEthernet5
a4ba.db45.4d31 Dynamic 730 FastEthernet5
0000.0c07.ac01 Dynamic 813 FastEthernet5
0000.0c07.ac02 Dynamic 813 FastEthernet5
0000.0c07.ac03 Dynamic 813 FastEthernet5
0000.212f.5bde Dynamic 813 FastEthernet8
0003.ba10.002a Dynamic 813 FastEthernet5
0004.23bb.299d Dynamic 813 FastEthernet5
0004.dd31.f958 Dynamic 813 FastEthernet5
0005.1e05.321b Dynamic 813 FastEthernet8
0005.1e05.3270 Dynamic 813 FastEthernet8
0005.1e05.7e4f Dynamic 813 FastEthernet4
0005.1e05.7e6b Dynamic 813 FastEthernet4
0014.4f46.4dc5 Dynamic 813 FastEthernet5
0014.4fa9.3ea6 Dynamic 813 FastEthernet5
0014.4fe3.114f Dynamic 813 FastEthernet5
0014.4fe3.1285 Dynamic 813 FastEthernet5
0014.4fe5.cec9 Dynamic 813 FastEthernet5
0014.4ff2.154d Dynamic 813 FastEthernet5
0014.4ff3.55f4 Dynamic 813 FastEthernet5
0014.4ff3.7782 Dynamic 813 FastEthernet5
0014.4ff3.778c Dynamic 813 FastEthernet5
0014.4ff9.65fd Dynamic 813 FastEthernet5
0014.4ff9.7c2e Dynamic 813 FastEthernet5
0014.4ff9.9f9f Dynamic 813 FastEthernet5
0014.4ff9.ba84 Dynamic 813 FastEthernet5
0014.4ff9.c70f Dynamic 813 FastEthernet5
0014.4ffa.1965 Dynamic 813 FastEthernet5
0014.5e60.8b84 Dynamic 813 FastEthernet5
0014.5e60.8b8a Dynamic 813 FastEthernet5
0014.5ecf.3df2 Dynamic 813 FastEthernet8
0014.5ee0.5cae Dynamic 813 FastEthernet5
0014.5ee0.8d8c Dynamic 813 FastEthernet5
0014.5ee0.ff28 Dynamic 813 FastEthernet5
0014.5ee1.2794 Dynamic 813 FastEthernet5
0014.5ee1.76d4 Dynamic 813 FastEthernet5
0014.5ee1.9d36 Dynamic 813 FastEthernet5
0014.5ef0.41fa Dynamic 813 FastEthernet8
0014.5ef0.4632 Dynamic 813 FastEthernet5
0014.5ef0.580c Dynamic 813 FastEthernet8
0014.5ef0.dfe6 Dynamic 813 FastEthernet5
0014.5ef0.e120 Dynamic 813 FastEthernet5
0014.5ef0.e130 Dynamic 813 FastEthernet5
0014.5ef9.1f13 Dynamic 813 FastEthernet5
0017.a477.0070 Dynamic 813 none
0017.a477.0080 Dynamic 813 none
router#sh mac-address-table | i none
0017.a477.0070 Dynamic 813 none
0017.a477.0080 Dynamic 813 none
0023.e904.d380 Dynamic 813 none
0023.e904.f680 Dynamic 813 none
Thanx
01-12-2012 11:51 PM
Hello,
To be honest, I am not sure what the "none" means here. I have went over available documentation but I was not able to find any relevant information. Does the communication work correctly with the stations with these MAC addresses? Is there any feature configured that might treat these MAC addresses specially, like port security, MAC ACLs, ...?
Best regards,
Peter
01-13-2012 12:10 AM
Two of my mac-address are flapping between switchA and router.
About 50% of time switchA points to router for mac-adddressA and router has "none" for that mac-addressA.
No special features enabled. Config:
version 12.3
service nagle
service timestamps debug datetime
service timestamps log datetime
service password-encryption
!
hostname router
!
boot-start-marker
boot-end-marker
!
logging buffered 64000 debugging
!
username cisco privilege 15 secret 5 $xxxWuVGayyDWjJqR/
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
aaa new-model
!
!
aaa authentication login default group tacacs+ line enable
aaa authentication login CONSOLE none
aaa authorization exec default group tacacs+
aaa session-id common
ip subnet-zero
!
!
ip cef
!
!
no ip domain lookup
ip domain name dev.agora.pl
ip name-server 10.1.1.1
ip ips po max-events 100
no ftp-server write-enable
!
!
!
!
!
!
!
interface BRI0
no ip address
shutdown
no cdp enable
!
interface FastEthernet0
description Outside
ip address 10.205.30.9 255.255.255.0
ip access-group z_outside in
ip nbar protocol-discovery
speed 100
full-duplex
!
interface FastEthernet1
description ssw03t1
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
shutdown
speed 100
full-duplex
!
interface FastEthernet2
description ssw03t1
switchport access vlan 731
switchport trunk native vlan 730
switchport mode trunk
no ip address
!
interface FastEthernet3
description ssm03f02
switchport access vlan 730
switchport mode trunk
no ip address
!
interface FastEthernet4
description ssm03f03
switchport access vlan 730
switchport mode trunk
no ip address
!
interface FastEthernet5
description ssm03r0
switchport mode trunk
no ip address
!
interface FastEthernet6
description ssm06f1
switchport access vlan 730
switchport mode trunk
no ip address
!
interface FastEthernet7
description ssm04f1
switchport access vlan 730
no ip address
!
interface FastEthernet8
switchport trunk native vlan 730
switchport mode trunk
no ip address
!
interface FastEthernet9
switchport access vlan 730
no ip address
no cdp enable
!
interface Vlan1
no ip address
!
interface Vlan702
ip address 10.207.2.1 255.255.255.0
ip access-group trader-dostep out
no ip redirects
no ip unreachables
no ip proxy-arp
!
interface Vlan730
description Inside
ip address 10.207.30.1 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
!
interface Vlan731
ip address 10.207.31.1 255.255.255.0
ip access-group unix-dostep out
!
interface Vlan780
ip address 10.207.80.1 255.255.255.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.205.30.1
ip route 10.208.20.1 255.255.255.255 10.207.30.181
ip route 10.208.20.2 255.255.255.255 10.207.30.180
!
!
no ip http server
ip http authentication local
ip http secure-server
ip http timeout-policy idle 600 life 86400 requests 10000
!
ip access-list extended loguj_zlych
permit ip 10.201.6.0 0.0.0.255 any
permit ip 10.201.10.0 0.0.0.255 any
permit ip 10.200.12.0 0.0.0.255 any
permit tcp any any eq telnet log-input
permit tcp any any log-input
permit udp any any log-input
permit ip any any log-input
ip access-list extended trader-dostep
permit ip 172.25.252.0 0.0.0.255 any
permit ip 172.28.252.0 0.0.0.255 any
permit ip 10.202.54.0 0.0.0.255 any
permit ip 10.202.59.0 0.0.0.255 any
permit ip host 10.205.42.112 any
permit ip 10.201.6.0 0.0.0.255 any
permit ip 10.201.10.0 0.0.0.255 any
permit ip 10.202.84.0 0.0.0.255 any
permit ip 172.26.7.0 0.0.0.255 any
ip access-list extended unix-dostep
permit ip 10.201.6.0 0.0.0.255 any
permit ip 10.201.4.0 0.0.0.255 any
ip access-list extended unix-out
ip access-list extended z_outisde
ip access-list extended z_outside
permit tcp host 10.1.1.3 eq smtp any
permit udp host 10.205.45.8 any
permit udp host 10.205.45.6 any
permit udp host 10.121.45.8 any
permit ip host 10.205.41.40 any
permit udp host 10.30.124.1 any
permit udp any host 10.207.30.240
permit udp host 10.1.1.1 eq domain any
permit udp host 10.205.41.130 any
permit udp host 10.205.41.131 any
permit tcp host 10.205.41.131 eq tacacs any
permit tcp host 10.205.41.130 eq tacacs any
permit icmp any any
permit ip host 10.200.3.100 any
permit ip host 10.205.42.70 any
permit ip host 10.205.50.50 any
permit ip host 10.205.50.100 any
permit ip host 10.205.42.112 any
permit ip host 10.205.42.100 any
permit ip host 10.205.42.101 any
permit ip host 10.205.42.71 any
permit ip 10.200.12.0 0.0.0.255 any
permit ip 10.201.6.0 0.0.0.255 any
permit ip host 10.205.73.75 any
permit ip host 10.205.73.76 any
permit ip 172.26.0.0 0.0.255.255 10.207.30.0 0.0.0.255
permit ip 172.25.0.0 0.0.255.255 10.207.30.0 0.0.0.255
permit ip 10.205.62.0 0.0.0.255 10.207.30.0 0.0.0.255
permit ip 10.202.84.0 0.0.0.255 10.207.30.0 0.0.0.255
permit ip 10.205.28.0 0.0.0.255 10.207.30.0 0.0.0.255
permit ip 10.201.10.0 0.0.0.255 10.207.30.0 0.0.0.255
permit ip 10.201.4.0 0.0.0.255 10.207.30.0 0.0.0.255
deny tcp any any eq telnet log-input
deny tcp any any
deny udp any any
!
logging trap debugging
logging 10.205.50.100
access-list 74 permit 193.42.230.15
access-list 74 permit 193.42.230.10
access-list 74 permit 193.42.230.77
access-list 74 permit 193.42.230.78
access-list 74 permit 193.42.230.72
access-list 74 permit 193.42.230.75
access-list 74 permit 193.42.230.68
access-list 74 permit 10.205.42.160
access-list 74 permit 10.205.42.120
access-list 74 permit 10.205.42.112
access-list 74 permit 10.205.3.100
access-list 74 permit 10.200.3.100
access-list 74 permit 10.205.42.70
access-list 74 permit 10.205.73.75
access-list 74 permit 10.205.50.50
access-list 74 deny any
access-list 75 permit 10.205.42.101
access-list 75 permit 10.205.42.100
access-list 75 permit 10.205.50.100
access-list 75 permit 10.205.42.112
access-list 75 permit 10.200.3.100
access-list 75 permit 10.205.42.70
access-list 75 permit 10.201.10.100
access-list 75 permit 10.205.50.50
access-list 75 permit 10.205.41.50
access-list 75 deny any log
arp 10.207.30.22 000d.6046.ddcd ARPA
arp 10.207.30.21 000d.6046.dd99 ARPA
!
!
!
tacacs-server host 10.205.42.100
tacacs-server host 10.205.42.101
!
control-plane
!
line con 0
password 7 xx
line aux 0
password 7xx
transport input all
line vty 0 4
privilege level 15
password 7 xx
transport input telnet ssh
line vty 5 15
privilege level 15
password 7 xx
transport input telnet ssh
!
no scheduler allocate
ntp clock-period 17180244
ntp server 10.1.0.6
01-13-2012 01:22 AM
Hello,
Perhaps we should focus on the flapping issue itself. Is it possible for you to post an exhibit of your network and indicate the position of the station with the MAC address that is reported as flapping?
Flapping MAC is usually caused by a switching loop.
Best regards,
Peter
01-13-2012 02:33 AM
Yes, but to have a switching loop i need to have at least 3 switches (or 2 switches with more than single link)
I have just two switches connected by one link and
1. sometimes both of them says that specified mac address is on that link pointing to each other
2. sometimes one of them says it's on that link and the other one says it's "none".
3. sometimes it's ok and i can ping station.
STP is stable, trunk is ok, native vlans ok.
Loop is not possible because there is only a single path for the specified mac -address.
My switch is 3524XL with 12.0(5)WC5 - maybe there are some bugs....
01-13-2012 02:41 AM
Hi,
I see 6 trunks plus 2 access ports configured on your router.
How are they connected to your switches?
And your switches are not connected each to the other?
HTH,
Milan
01-13-2012 02:46 AM
SwitchA---Router-------Several other switches
The problem is between SwitchA and Router (which is also switch).
There are several other switches connected to that router - and that trunks even have the same vlans but - there is no loop in physical topology - so for STP all links are always in forwarding state ("Several other switches" are connected by a single link to Router)
01-13-2012 02:57 AM
Hmm, only one idea coming to my mind:
Some VLAN mismatch.
I see native VLAN 730 on one port while default left on other trunks.
Is that correct?
BR,
Milan
01-13-2012 03:06 AM
Yes, that's correct, only on one link native vlan is different.
Native vlans are consistent and stable.
Another strange thing on SwitchA, 0011.2233.4455 should be seen on fa0/4:
SwitchA#sh mac-address-table | i 0011.22
0011.2233.4455 Dynamic 813 FastEthernet0/24
SwitchA#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SwitchA(config)#mac-address-table static 0011.2233.4455 fastEthernet 0/4 vlan 813
SwitchA(config)#exit
SwitchA#sh mac-address-table | i 0011.22
0011.2233.4455 813 Fa0/1
Why after adding static mac-address to correct interface "sh mac-addr" show fa0/1 ?
Thanx
01-13-2012 03:34 AM
Hi,
This is completely strange. Can you please also post the config of your switch? It is indeed possible that the IOS is buggy and/or the switch needs reloading.
Oh, and another question: are there any wireless access points in your network? Is it possible that some clients are connected to your network both via wireless and wired connection? Alternatively, is it possible that any of your computers is connected to your network using two or more network cards?
Milan, I've sent you a private message - just want to make sure you don't miss it
Best regards,
Peter
01-13-2012 03:44 AM
i am pretty sure SwitchA is faulty (hardware or very old 12.0 software).
Mac address/L2 subsystem seems to behave uncorrectly.
I'll try to replace this switch and check it.
Thanx
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