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Juniper Bandwidth Restriction to Single IP
 
#set firewall policer 10mb  if-exceeding bandwidth-limit 10m
#set firewall policer 10mb  if-exceeding burst-size-limit 1m
#set firewall policer 10mb  then discard
[Create policer name 10mb for 10mb bandwidth]

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Juniper Turning On Logging
 
You want to monitor all systemwide operations by saving all log messages to a file on the router. Use the following commands to save all log messages to a file called messages:

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Juniper Routes in the Forwarding Table
 
You want to see the routes that RPD has installed in the forwarding table and that the router is actually using to forward packets.
Use the show route forwarding-table command to see the active routes in the

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Juniper Multiple IP Address on a Single interface
 
For some point-to-multipoint, you configure multiple address on a single logical interface:
 
# set interfaces ge-0/0/0 unit 0 family inet address 192.168.100.2/24

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Juniper SNMP Confuguration 
 
Enable SNMP 
#set snmp community juniper authorization read-only
[Here SNMP will be enabled and Community name is juniper]

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Configure Aggregate Routes in Juniper
 
You want to aggregate some of the routes in the routing table to reduce the size of the tables and to minimize the amount of routing-information advertisements between routers.
Configure an aggregate route that covers the specific routes beneath it:

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Password Recovery Process for Juniper
 

Step1
You must have a console connection

Step2
Reboot the system

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How to install Juniper OS Step by Step
 
For juniper OS instalation you must login as a root.
 
Step 1 
Copy your OS to a USB drive.
 
Step2

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Juniper Check optical laser power level
 
Here you can check Laser output and Input power level.
Also all SFP related informtion.
I am gathering information for interface ge-0/0/10
 
# run show interfaces diagnostics optics ge-0/0/10
Physical interface: ge-0/0/10

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Juniper Aggregate Ethernet / Ether Channel / Ether Bundle at Router

Need to configure at chassis to make this device enable aggregate.
Aggregate interface works upto 8 interface.
# set chassis aggregated-devices ethernet device-count 4
[Here I create four aggregate interface like ae0 ae1 ae2 and ae3]

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Juniper User Permission Level

First you need to create a Class 

#set system login class Read permissions view
#set system login class Read permissions view-configuration
#set system login class Read allow-commands ping

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Juniper Change the Format of Plain-Text Passwords
 
You want to require the passwords for user accounts to be longer than six characters and to have more than one case change.
Set all plain-text passwords to be from 8 to 20 characters long and to contain at least 

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Juniper Blackhole Routes / Null0 Routes
 
You don't want to route any traffic to particular networks. This is equvalent as cisco Null0 router. 
Define static routes to these networks that discard the traffic:

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How to show Date and Time in Juniper

# run show system uptime
Current time: 2014-12-11 14:35:32 BDT
System booted: 2013-09-11 18:12:54 BDT (65w0d 20:22 ago)

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