Switching

hi

I would like to know maximum active vlan on datasheet  juniper swtich  like cisco switch, could you pleae help.

thanks

4093

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hi 

what is word of datasheet that refer 4093 (not vlan id) of juniper product.

thanks

You have this in the datasheet: Number of VLANs: 4,096

However, few of them are reserved and cannot be used, hence the 4093 available vlans.

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Thank you very much for reply

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On

http://www.juniper.net/techpubs/en_US/junos11.4/topics/concept/bridging-ex-series-understanding.html

see

Packets Are Either Tagged or Untagged

....packets belong to. The presence of these unique IDs means the packets are now tagged. VLAN tags 0 and 4095 are reserved by the Juniper Networks Junos operating system (Junos OS), so you cannot assign those tags to a VLAN in your network. The VLAN tags 1 through 4094 can be assigned to VLANs.

What is not mentioned is when you enable vstp , to have similar behave of cisco pvstp.

With vstp you go down to up 253 vlans only.

Here is a lab that I did on a ex3300

mylogin@lab-ex330# run show vlans summary

VLANs summary:
    Total: 4094, Configured VLANs: 4093
    Internal VLANs: 1,  Temporary VLANs: 0

Dot1q VLANs summary:
    Total: 4094, Tagged VLANs: 4093, Untagged VLANs: 1

{master:0}[edit]
mylogin@lab-ex330# run show vlans vlan.0   
error: vlan vlan.0 does not exist

{master:0}[edit]
mylogin@lab-ex330# run show vlans vlan.1   
Name           Tag     Interfaces
vlan.1         1     
                       None

{master:0}[edit]
mylogin@lab-ex330# run show vlans vlan.4094
error: vlan vlan.4094 does not exist

{master:0}[edit]
mylogin@lab-ex330# run show vlans vlan.4095   
error: vlan vlan.4095 does not exist

{master:0}[edit]
mylogin@lab-ex330# run show vlans vlan.3959   
Name           Tag     Interfaces
vlan.3959      3959  
                       None

{master:0}[edit]
mylogin@lab-ex330# set vlans vlan.0 vlan-id 0
                                                    ^
Value 0 is not within range (1..4094) at '0'

{master:0}[edit]
mylogin@lab-ex330# set vlans vlan.1 vlan-id 1  

{master:0}[edit]
mylogin@lab-ex330# set vlans vlan.4094 vlan-id 4094

{master:0}[edit]
mylogin@lab-ex330# set vlans vlan.4095 vlan-id 4095   
error: Value 4095 is not within range (1..4094): 4095

{master:0}[edit]
mylogin@lab-ex330# set vlans ?
Possible completions:
  <vlan-name>          VLAN name
+ apply-groups         Groups from which to inherit configuration data
+ apply-groups-except  Don't inherit configuration data from these groups
  default              VLAN name
> traceoptions         VLAN trace options
  vlan.1               VLAN name
  vlan.10              VLAN name

{master:0}[edit]
mylogin@lab-ex330# show | compare
[edit vlans]
+   vlan.4094 {
+       vlan-id 4094;
+   }
+   vlan.4095;

{master:0}[edit]
mylogin@lab-ex330# commit
[edit vlans]
  'vlan.998'
    Maximum number of vlans cannot exceed 4094, including <default> vlan.
error: configuration check-out failed

{master:0}[edit]
mylogin@lab-ex330# delete vlans vlan.4095

{master:0}[edit]
mylogin@lab-ex330# commit
[edit vlans]
  'vlan.999'
    Maximum number of vlans cannot exceed 4094, including <default> vlan.
error: configuration check-out failed

{master:0}[edit]
mylogin@lab-ex330# delete vlans vlan.4094   

{master:0}[edit]
mylogin@lab-ex330# commit
configuration check succeeds
fpc1:
commit complete
commit complete

{master:0}[edit]
mylogin@lab-ex330#

!!! now when enabling vstp,

mylogin@lab-ex330# commit check
[edit protocols vstp]
  'vlan all'
    Cannot configure VSTP on all VLANs when more than 253 VLANs are configured. Configure vstp vlan-group along

with STP or RSTP to cover all VLANs
[edit protocols]
  'vstp'
     Failed to configure vstp on all vlans
error: configuration check-out failed

{master:0}[edit]
mylogin@lab-ex330#

i'm confuse in word on url  

http://www.juniper.net/techpubs/en_US/junos11.4/topics/concept/bridging-ex-series-understanding.html

Maximum VLANs and VLAN Members Per Switch

The number of VLANs supported per switch varies for each switch. Use the configuration-mode command set vlans id vlan-id ? to determine the maximum number of VLANs allowed on a switch. You cannot exceed this VLAN limit because you have to assign a specific ID number when you create a VLAN—you could overwrite one of the numbers, but you cannot exceed the limit. You can, however, exceed the recommended VLAN member maximum for a switch. To determine the maximum number of VLAN members allowed on a switch, multiply the VLAN maximum for the switch times 8 (vmember limit = vlan max * 8).

If a switch configuration exceeds the recommended VLAN member maximum, you see a warning message when you commit the configuration. If you ignore the warning and commit such a configuration, the configuration succeeds, but you risk crashing the Ethernet switching process (eswd) due to memory allocation failure.

So, Can you please explain for me about "multiply the VLAN maximum for the switch times 8 (vmember limit = vlan max * 8)"   ?

thanks you..

So the vlan ID is a number that is tagged so the swithc can isolate broadcast traffic and send data only to the ports that are identified by that ID number. Now imagine a port ge-0/0/9.0 assigned a vlan id 900. That is just the ID value. How many computers/laptops/printers etc  can be tagged with that ID number. In other words how many members can have that ID assigned, if say that single port was connected another switch which has X number of members attached. That is all it is, the muber of devices/members that can have that ID assigned.