10-09-2008 02:36 AM - edited 03-03-2019 11:51 PM
Hello!
On of my friends has a problem with a C7609. On all interfaces there is the same mac-address (see below). Do you know why this is happening?
Thanks!
FastEthernet4/1/1 is up, line protocol is up
Hardware is i82543 FastEthernet Interface, address is 001b.0de5.e540 (bia 001b.0de5.e540)
Description: WCDMA SUA Sigtran B
Internet address is 10.207.29.246/30
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 00:00:01, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/200/0/0 (size/max/drops/flushes); Total output drops: 182446
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
2292 packets input, 141335 bytes, 0 no buffer
Received 48 broadcasts (0 IP multicasts)
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
3487 packets output, 209543 bytes, 0 underruns
8 output errors, 0 collisions, 3 interface resets
0 babbles, 0 late collision, 0 deferred
5 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
GigabitEthernet5/1 is administratively down, line protocol is down (disabled)
Hardware is C6k 1000Mb 802.3, address is 001b.0de5.e540 (bia 001b.0de5.e540)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s
input flow-control is off, output flow-control is off
Clock mode is auto
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, 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: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
GigabitEthernet5/2 is administratively down, line protocol is down (disabled)
Hardware is C6k 1000Mb 802.3, address is 001b.0de5.e540 (bia 001b.0de5.e540)
Description: Management Access
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s
Media-type configured as SFP connector
input flow-control is off, output flow-control is off
Clock mode is auto
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, 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: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
10-11-2008 12:40 AM
By default, Catalyst switches come with the same MAC address configured on all interfaces.
This is not a problem. Try removing the ip address from the interface and make it an L2 port. you should see that the mac-address chnages
Narayan
10-14-2008 08:10 AM
Hello,
Could you please explain me how to do it by commands
I faced the same situation in the past & I've set manually new MAC addresses for the interfaces that I want to use (I've add +1 from the Built in mac address)
Tarik
10-14-2008 08:38 AM
Tarik,
Actually the way you adopted is the right one cos it may not be feasibel for you to chnage a L3 port to L2 port based on your topology
In terms of commands, its just turning an L3 port to L2 for eg.
interface fa 0/1
no ip addres
switchport
Have a look here
https://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00801c9b4e.shtml
HTH
Narayan
07-02-2014 01:42 PM
Please correct me if I am wrong, but cisco 7609 is a router not a catalyst switch.
I faced an issue where two of my router ports(Gig7/0/0 and Gig8/0/0) are connected to switch ports(Gi1/0/26 and Gi1/0/27) respectively.
Multiple dot1q sub-interfaces are configured on the router ports.
Due to some misconfiguration same vlan 10 is assigned to sub-interfaces gig7/0/0.10 and gig8/0/0.10, which lead to continuous macflap for vlan 10 on switch.
This macflap lead to bgp session flap which created a havoc in the network.
2xGE V2 SPA cards are inserted in module 7 and module 8.
Router#sh arp vrf abc
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.108.144.217 - 0027.0dfd.2840 ARPA GigabitEthernet7/0/0.10
Internet 10.108.144.218 150 0015.2c27.5d04 ARPA GigabitEthernet7/0/0.10
Router#
Router#sh arp vrf xyz
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.108.145.5 - 0027.0dfd.2840 ARPA GigabitEthernet8/0/0.10
Internet 10.108.145.6 174 04fe.7f91.9911 ARPA GigabitEthernet8/0/0.10
Router#
Switch#sh log | i 10
Jul 2 10:35:06.177 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0027.0dfd.2840 in vlan 10 is flapping between port Gi1/0/26 and port Gi1/0/27
Jul 2 10:41:39.864 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0027.0dfd.2840 in vlan 10 is flapping between port Gi1/0/26 and port Gi1/0/27
Jul 2 11:46:37.377 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0027.0dfd.2840 in vlan 10 is flapping between port Gi1/0/26 and port Gi1/0/27
Jul 2 11:59:04.436 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0027.0dfd.2840 in vlan 10 is flapping between port Gi1/0/27 and port Gi1/0/26
Jul 2 12:09:10.137 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0027.0dfd.2840 in vlan 10 is flapping between port Gi1/0/26 and port Gi1/0/27
Jul 2 12:49:31.744 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0027.0dfd.2840 in vlan 10 is flapping between port Gi1/0/26 and port Gi1/0/27
Jul 2 13:51:23.690 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0027.0dfd.2840 in vlan 10 is flapping between port Gi1/0/26 and port Gi1/0/27
Jul 2 14:17:19.690 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0027.0dfd.2840 in vlan 10 is flapping between port Gi1/0/27 and port Gi1/0/26
Jul 2 14:35:58.743 UTC: %SW_MATM-4-MACFLAP_NOTIF: Host 0027.0dfd.2840 in vlan 10 is flapping between port Gi1/0/26 and port Gi1/0/27
Why the physical interface on the router does not have unique mac address ?
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