{"id":199,"date":"2020-09-26T13:24:54","date_gmt":"2020-09-26T13:24:54","guid":{"rendered":"https:\/\/dft.wiki\/?p=199"},"modified":"2021-02-07T20:14:35","modified_gmt":"2021-02-07T20:14:35","slug":"vlan-and-trunk-on-cisco-switches","status":"publish","type":"post","link":"https:\/\/dft.wiki\/?p=199","title":{"rendered":"VLAN and TRUNK on Cisco Switches"},"content":{"rendered":"

Given the scenario, where the blocks blue and red are groups of computers in a different physical location (building of floors).<\/p>\n

\"\"<\/figure>\n

The VLAN1 is the default VLAN on all ports and any computer can reach the others with no filter or restriction.<\/p>\n

The connection between both switches works as a “bridge”.<\/p>\n

Dividing the network in VLANs increase security, reduces the number of routers and reduces the broadcast messages in the segments.<\/p>\n

The “bridge” that interconnects switches becomes a Trunk Link.<\/p>\n

\"\"<\/figure>\n

Configuration:<\/p>\n

\n
\n

Switch1<\/p>\n

enable 
configure terminal 
hostname Switch1
no ip domain lookup
line con 0
logging synchronous

vlan 10
name Pink
vlan 20
name Green
vlan 30
name Orange

interface f0\/1
switchport mode access
switchport access vlan 10
interface f0\/2
switchport mode access
switchport access vlan 20
interface f0\/3
switchport mode access
switchport access vlan 30

interface range f0\/4-24
shutdown

interface g0\/1
switchport mode trunk<\/pre>\n<\/div>\n
\n
Switch2<\/p>\n
enable 
configure terminal 
hostname Switch2
no ip domain lookup
line con 0
logging synchronous

vlan 10
name Pink
vlan 20
name Green
vlan 30
name Orange

interface f0\/1
switchport mode access
switchport access vlan 30
interface f0\/2
switchport mode access
switchport access vlan 10
interface f0\/3
switchport mode access
switchport access vlan 20

interface range f0\/4-24
shutdown

interface g0\/1
switchport mode trunk<\/pre>\n<\/div>\n<\/div>\n
Now, even if all the computers get IPs in the same network, they will not be able to communicate with each other if they are not in the same VLAN.<\/p>\n
To check the configuration in each Switch issue the commands:<\/p>\n
show vlan brief
show interface trunk<\/pre>\n
Learn more about [VLAN<\/a> – NexGenT]<\/p>\n
Learn more about [TRUNK<\/a> – Network Direction]<\/p>\n
The following Post is about centralizing the VLAN configuration in a server-client hierarchy, called VTP [Read It<\/a>].<\/p>\n","protected":false},"excerpt":{"rendered":"
Given the scenario, where the blocks blue and red are groups of computers in a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-199","post","type-post","status-publish","format-standard","hentry","category-ccna"],"_links":{"self":[{"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/posts\/199","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dft.wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=199"}],"version-history":[{"count":5,"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/posts\/199\/revisions"}],"predecessor-version":[{"id":1028,"href":"https:\/\/dft.wiki\/index.php?rest_route=\/wp\/v2\/posts\/199\/revisions\/1028"}],"wp:attachment":[{"href":"https:\/\/dft.wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=199"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dft.wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=199"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dft.wiki\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}