STP

[jain.manish94]

Please can someone tell me meaning of each line.

Port 257 (GigabitEthernet3/1) of VLAN0102 is designated forwarding
Port path cost 4, Port priority 128, Port Identifier 128.257.
Designated root has priority 4198, address d0c7.89a9.c940
Designated bridge has priority 4198, address d0c7.89a9.c940
Designated port id is 128.257, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 427353, received 3

[jain.manish94]

i just did  nslookup loog009 (hostname) it is showing any other ip address 

but when i checked user machine he is getting ip from dhcp getting other ip address

how it is possible...

[Mark Malone]

Only 1 sup can be active at a time , check show mod it will tell you whats active in what slot

[jain.manish94]

ok thanks mark

please can you tell me some about wireless lan controller. 

1. when we connect one AP threw Switch how it send request to WLC in both , i mean L2 and L3 . please can you tell me full information regarding this....

[jain.manish94]

Hello 

good morning, 

are u busy ,

please can you tell me some about wireless lan controller. 

1. when we connect one AP threw Switch how it send request to WLC in both , i mean L2 and L3 . please can you tell me full information regarding this....

[Mark Malone]

hi

im only back in the office today , I don't work on wireless cisco only aruba

your better off opening that question in the wireless section forum

[jain.manish94]

Hello , 

good morning, 

please can you tell me what is the meaning of these line.

Create Layer2 Vlan on Both Core and allowed towards Southbound switches

Create Layer3 Vlan on Both Core and allowed towards Southbound Switch 

what is the meaning of L2 Vlan and L3 Vlan, 

[Mark Malone]

layer 2 vlan is a vlan added just to the layer 2 database , klayer 3 vlan is an vlan interface interface vlan x 

[jain.manish94]

means please give me one example . i always create int vlan no. 

[Mark Malone]

L2

(conf t)

vlan 10

name mark

L3

interface vlan 10

ip address x.x.x.x

[jain.manish94]

L2

(conf t)

vlan 10

name mark

L3

interface vlan 10

ip address x.x.x.x

why we do this , what is the benefits of this. please tell me. 

[Mark Malone]

its the  way the OSI layers work in order from layer 1 -7 , vlans exist at layer 2 and 3 , the layer 3 breaks the broadcast domain stops unnecessary flooding

[jain.manish94]

thanks for reply 

and why we create L2 vlan ...

[Mark Malone]

basically because you have too, layer 3 vlan wont work if there is no layer 2 , its the way the OSI layers work

[jain.manish94]

and suppose i am using L3 switch and don create L2 vlan only Layer 3 vlan i create., here it will not work... ?

[Mark Malone]

That's not possible if you only create a layer 3 vlan it will either automatically create it at layer 2 or it will not come up/up at all until layer 2 is in place