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special mac address used in a catalyst

jabouaf
Level 1
Level 1

Hello,

Question 1

Does some could explaine me what is the purpose of mac-addresses starting with 3333.0000.xxxx in the following display:

2 of them are used by "Switch", one by "Router",

Why Switch and Router do they need them ?

The STP address used for any vlan is not starting by 3333.0000.

Sup720_JAB#sh mac-address-table sta | inclu 67

* 67 3333.0000.000d static Yes - Fa3/30,Fa3/32,Fa3/33,Fa4/5

* 67 3333.0000.0001 static Yes - Switch

* 67 3333.0000.0016 static Yes - Switch

* 67 000e.39ee.fc00 static No - Router

Sup720_JAB#

On others switches we could have an aonther value than 3333.0000. .

Question 2

Does some know why there is one MAC-address (b.i.a) for all vlan interfaces ?

Sup720_JAB#sh int vlan 1

Vlan1 is up, line protocol is up

Hardware is EtherSVI, address is 000e.39ee.fc00 (bia 000e.39ee.fc00)

.............;

Sup720_JAB#sh int vlan 60

Vlan60 is up, line protocol is up

Hardware is EtherSVI, address is 000e.39ee.fc00 (bia 000e.39ee.fc00)

..................

Sup720_JAB#sh int vlan 67

Vlan67 is up, line protocol is up

Hardware is EtherSVI, address is 000e.39ee.fc00 (bia 000e.39ee.fc00)

...........................

Sup720_JAB#sh ip arp

Protocol Address Age (min) Hardware Addr Type Interface

Internet 67.67.67.65 - 000e.39ee.fc00 ARPA Vlan67

Internet 10.2.1.1 0 00e0.1ea7.0c5a ARPA Vlan1

Internet 10.2.2.36 29 0002.b963.0c00 ARPA Vlan1

Internet 10.2.1.65 - 000e.39ee.fc00 ARPA Vlan1

Internet 50.50.50.65 - 000e.39ee.fc00 ARPA Vlan50

Internet 60.60.60.65 - 000e.39ee.fc00 ARPA Vlan60

Internet 60.60.60.137 214 000a.8a1d.6480 ARPA Vlan60

Internet 50.50.50.137 26 000a.8a1d.6480 ARPA Vlan50

Internet 67.67.67.137 214 000a.8a1d.6480 ARPA Vlan67

Internet 10.2.1.253 0 00e0.1e68.4091 ARPA Vlan1

Sup720_JAB#

up720_JAB#sh catalyst6000 chassis-mac-addresses

chassis MAC addresses: 1024 addresses from 000e.39ee.fc00 to 000e.39ee.ffff

Sup720_JAB#

Sup720_JAB#sh spanning-tree vlan 67

VLAN0067

Spanning tree enabled protocol ieee

Root ID Priority 32768

Address 000e.39ee.fc43

This bridge is the root

Regards,

1 Accepted Solution

Accepted Solutions

Prashanth Krishnappa
Cisco Employee
Cisco Employee

The static mac-address you are refering to is programmed in hardware automatically by the

SUP720 software. This is normal behavior. The address is reserved for IPv6 all-nodes multicast.

View solution in original post

2 Replies 2

Prashanth Krishnappa
Cisco Employee
Cisco Employee

The static mac-address you are refering to is programmed in hardware automatically by the

SUP720 software. This is normal behavior. The address is reserved for IPv6 all-nodes multicast.

Hello,

Thank you for this information.

I found a link about this:

http://www.cisco.com/en/US/partner/tech/tk828/technologies_white_paper09186a0080203e90.shtml

white paper about CISCO IOS IPv6 MULTICAST INTRODUCTION

There is a new OUI format for IPv6 Multicast. The leading two Bytes are set to 33-33

Thank you.

Review Cisco Networking for a $25 gift card