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Webcast-Catalyst9k
New Member

VSPANing (100bT) on 10bT and 100bT Ports?

Cat6509-v6.3(3a)-SUP1

I want to SPAN two different admin port w/ diff speed to one dest SPAN port.

For example:

port # 6/42-10Mbps-Half duplex - Port to SPAN-VLAN100-No trunk

port # 6/43-100Mbps-Full duplex - Port to SPAN-VLAN100-No trunk

port # 6/48-100Mbps-Full duplx- SPAN port-VLAN100-No trunk

==========================

> sh span ---> gives belwo output

==========================

Destination : Port 6/48

Admin Source : Port 6/42-43

Oper Source : None

Direction : transmit/receive

Incoming Packets: disabled

Learning : enabled

Multicast : disabled

Filter : -

Status : inactive

=======================

Q.1: Can 6/48 SPAN 6/42 and 46/43 corrrectly, as both ports has diff speed?

Q.2: Shouel I see 802.1p/Q header, If i connect snffer to 6/48?

Sniffer is no VLAN (NIC does not support it).

Q.3: Is it valid scenario? If not what is best bet?

=======================

Thx

Kal

2 REPLIES
New Member

Re: VSPANing (100bT) on 10bT and 100bT Ports?

Kal,

Q.1: I see nothing wrong with this configuration. But you do have a possibility of oversubscribing your destination port.

Q.2: You should see all packets that traverse these ports. If these are not trunks, you should not see 802.1Q headers.

Q.3: If you want to sniff packets from resources connected to ports 6/42 and 6/43 and send copies of these packets to port 6/48, then you have a correct configuration.

New Member

Re: VSPANing (100bT) on 10bT and 100bT Ports?

Thx for reply!

BUT

Once i enable trunking on Cat6509 ports and then i have to explictly use SPAN. Becuasse of port availabilioty limitation I am forced to use HUB and once i use HUB then there is PROB with trunk ports.

i.e:

MORE SUBNETS in ONE HUB BROADCAST DOMAIN...Right?

Let me put in a simple way.

I want to verify that host that is connected to Cat6509 is sending correct info of

Layer 2 - VLAN header with 802.1p/Q priority value to Cat6509. What would you suggest? OR What is best way to put HUB between switch port and host connected to that switch port to verify Layer2 802.1p/Q info?

Correct me if 'm missing anything.

Kal

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