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مقالات شبکه و کامپیوتر

بايگاني براي the 'Cisco' Category

Define eq in ACL cisco

http://www.techexams.net/forums/ccna-ccent/78918-what-does-eq-acls-mean.html

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Redirect HTTP traffic to Cache-server in router cisco

http://www.vmwareandme.com/2013/10/guide-how-to-redirect-http-traffic-from_23.html

 

https://supportforums.cisco.com/t5/wan-routing-and-switching/redirect-web-traffic-to-external-proxy-in-a-specific-port/td-p/1391832

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Define ACL in cisco in persian

http://www.persianadmins.ir/v2/articles/cisco/cisco-list/107-cisco-access-list.html

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Show cdp neighbers by detail

switch1#sh cdp nei gi0/12 d

 

https://supportforums.cisco.com/t5/lan-switching-and-routing/ip-address-in-show-cdp-neighbor-detail-command/td-p/1491871

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config ntp and timezone in cisco

Config NTP Server

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_55_se/configuration/guide/scg_2960/swadmin.html

 

Config Timezone

 

https://supportforums.cisco.com/t5/lan-switching-and-routing/how-to-set-indian-timezone-on-cisco-3750-switch/td-p/2706642

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show users to connect CLI cisco

who

 

or

 

Show or List Which Users Are Logged into a Cisco Router

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Config SPAN and RSPAN on switch cisco

 

How to configure SPAN and RSPAN in Cisco Catalyst switches

 

 

 

 

  • Local SPAN-The SPAN feature is local when the monitored ports are all located on the same switch as the destination port. This feature is in contrast to Remote SPAN (RSPAN), which this list also defines.
  • Remote SPAN (RSPAN)-Some source ports are not located on the same switch as the destination port. RSPAN is an advanced feature that requires a special VLAN to carry the traffic that is monitored by SPAN between switches. RSPAN is not supported on all switches. Check the respective release notes or configuration guide to see if you can use RSPAN on the switch that you deploy.
  • Port-based SPAN (PSPAN)-The user specifies one or several source ports on the switch and one destination port.
  • VLAN-based SPAN (VSPAN)-On a particular switch, the user can choose to monitor all the ports that belong to a particular VLAN in a single command.
  • ESPAN-This means enhanced SPAN version. This term has been used several times during the evolution of the SPAN in order to name additional features. Therefore, the term is not very clear. Use of this term is avoided in this document.
  • Administrative source-A list of source ports or VLANs that have been configured to be monitored.
  • Operational source-A list of ports that are effectively monitored. This list of ports can be different from the administrative source. For example, a port that is in shutdown mode can appear in the administrative source, but is not effectively monitored.

 

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How update Switch Cisco by tftp

Procedure for Upgrading Cisco Catalyst 2960 Switch IOS

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portfast and portfast trunk in cisco

First of all PortFast is Cisco proprietary.
PortFast can negatively effect DHCP services.

PortFast is used to more quickly prevent and eliminate bridging loops.
You can use PortFast to connect a single end station or a switch port to a switch port. If you enable PortFast on a port that is connected to another Layer 2 device, such as a switch, you might create network loops.

And Spanning-tree portfast trunk should never be used on switch interconnects because with switch interconnects you want STP to make sure there is no loop before forwarding.
You can configure This command is really designed for servers which are running 802.1q on their NICs and which can transition to forwarding immediately.

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How Upgrade Cisco 2960

How to: replace a Cisco 2960 switch and upgrade firmware

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