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C7609 same mac-address on all interfaces

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)

4 REPLIES

Re: C7609 same mac-address on all interfaces

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

New Member

Re: C7609 same mac-address on all interfaces

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

Re: C7609 same mac-address on all interfaces

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

New Member

Please correct me if I am

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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