Trunking
Connecting VLANs
- VLANs can exist on multiple switches
- Connecting VLANs without trunks
- Requires access links (one per VLAN)
- Doesn't scale well
- Better alternative is trunk links
- Cisco sends all traffic across the trunk link
/CAP/Network+/Visual%20Aids/Pasted%20image%2020250210132428.png)
- Uplinks are actually just associated with the VLAN
- IS almost like the network is splitted right down the middle
Trunking
-
Instead of using individual wires for each VLAN
-
Trunk link carries frames from all the different VLANs
-
IEEE 802.1q
-
Trunk port tags on egress
-
Tag removed on ingress
-
Connecting VLANs with trunks
- The opposite of an access point.
- Requires a single link
- Physical
- Logical
-
Trunks carry all VLANs by default
- Can set allowed lists on trunks
-
Native VLAN is untagged
-
VLAN tags gives us the ability to isolate our traffic
- Also gives us the ability to do quality of service