Skip to main content

VLAN, TRUNKING, VTP

VLAN, TRUNKING, VTP

Vlan trunking

-Vlan divides the broadcast domain
-In New switch, Default Vlan = Native Vlan = Vlan 1
-Native Vlan can be changed from Vlan 1 to Vlan10, 20 etc.
-Vlan 1 cannot be deleted even after entering command
-Vlan 1 carries critical traffic like CDP, VTP etc.
-Access port carries traffic of only one vlan
-Trunk port carries traffic of more than one vlan
-Voice vlan can carry traffic of two vlan’s
-Layer 3 vlan required for Inter-Vlan communication
-On Router, For Inter-Vlan comunication, “Router on Stick” is implemented
-On Switches, For Inter-Vlan comunication,”Layer 3 vlan or SVI” is implemented
-To allow end to end communication, we need to allow Vlan on all the trunk ports in between
-Vlan can be created on Router, Switch, Firewall etc.
-Trunking is the process to enable multiple vlan’s traffic between different switches
-Conditions -Connected Port should be trunk, Encapsulation should match, Allowed Vlans on trunk port should be same

VTP key points

-VTP is Virtual Trunking Protocol, configured to manage Vlan’s
-VTP different versions -V1, V2, V3
-In VTP, different switch roles are Server, Client, Transparent, Off Mode
-Default mode of switch is Server mode
-Recommended to add new switch in Client Mode with Revision number=0
-Revision number can be made zero, if VTP domain name is changes to some bogus name
-Revision number can be made zero, if VTP mode is changes to Transparent mode
-Latest Revision number means Latest Vlan configuration
-Server Mode, we can create, modify & delete vlans
-Client Mode, When client gets update, switch will update itself & passes update further
-Client Mode, We cannot do vlan related changes on client mode, switch will give error message
-Transparent Mode, When Transparent gets update, switch will not update itself & passes update further
-Transparent Mode, Changes performed on the Transparent will not be replicated to other switches
-Off Mode, When switch in Off mode gets update, switch will not update itself and do not pass further

VTP -Different versions

V1,V2 : Support upto Vlan number 1001, V3: Support upto Vlan number 4095
V1,V2 : Cannot transfer details of Private Vlans, V3 : Can transfer details of Private vlan as well
V1,V2 : Cannot carry MSTP region information, V3 : Can carry MSTP region information
V1,V2 : There is no option to make multiple Servers as Primary & secondary,
V3 : We can make Primary server out of multiple Server modes available
Labels:

Comments

Post a Comment

Popular posts from this blog

Checkpoint firewall common commands part 2

Checkpoint firewall common commands part 2 For basic firewall informaton gathering: fgate stat -Status and statistics of Flood-Gate-1. fwaccel <stat|stats|conns>  – View status, statistics or connection table of SecureXL. fw getifs -Show list of configured interfaces with IP and netmask. cpstat <app_flag> [-f flavour] -View OS, HW and CP application status. Issue cpstat without any options to see all possible application flags <app_flag> and corresponding flavours. Examples: cpstat fw -f policy – verbose policy info cpstat os -f cpu – CPU utilization statistics cpinfo -y all   -List all installed patches and hotfixes. cpd_sched_config print -Show task scheduled with CPD scheduler. enabled_blades -View enabled software blades avsu_client [-app <app>]   , get_version <app>  -Get signature version and status of content security .Without the -app option “Anti Virus” is used. show configuration -Show
Post a Comment
Read more

Unable to Connect to Server Checkpoint R80

Unable to Connect to Server Checkpoint R80 Unable to Connect to Server A connection to the management server will fail if: A firewall between SmartConsole and the management server blocks Port 19009 -  port 19009 is used for a new R80 service. Allow traffic on this port for all clients and management servers. No GUI clients are assigned -  Open the Gaia Portal. If the First Time Configuration Wizard opens, complete it. If the First Time Configuration Wizard has already run, open  User Management > GUI Clients  and add a client. When using Multi-Domain Security Management, connect SmartConsole to the Multi-Domain Server and make sure the domains have GUI clients assigned to them. The required processes are not reachable -  Make sure the computer with SmartConsole installed can reach the IP address of the management server, and that these server processes are up and running: cpm fwm Operation time out  – Your connection to the management (cloud demo
Post a Comment
Read more

Configuring Proxy ARP for Manual NAT

Configuring Proxy ARP for Manual NAT Symptoms After creating a Manual Static NAT rule, Security Gateway does not answer the ARP Requests for the Static NATed IP address that was configured in the Manual NAT rule. Security Gateway replies to ARP requests with a wrong MAC address, mostly for the NAT traffic.  Introduction Let us consider the following scenario: Two networks ( Network_A  and  Network_B ) are separated by a Security Gateway (single Security Gateway or ClusterXL). On each network, there is a host ( Host_A  on  Network_A ,  Host_B  on  Network_B ). Let us assume, that  Network_A  represents the  Internal  network, and  Network_B  represents the  External  network. According to the existing standards, when  Host_B  needs to send data to  Host_A , an ARP Request for the MAC address of  Host_A  will be sent by  Host_B  to  Network_B . Since  Host_A  is located on another network, and the Security Gateway acts as a router, this ARP Request (sent
Post a Comment
Read more