What is the correct method to allow VLAN 100 on a VSX pair inter-switch-link 256 for port 1/45 and 2/45?

What is the correct method to allow VLAN 100 on a VSX pair inter-switch-link 256 for port 1/45 and 2/45?

• A. vlan trunk allowed 100 for ports 1/45 and 1/46
• B. vlan trunk add 100 in LAG256
• C. vlan trunk allowed 100 in LAG256
• D. vlan trunk add 100 in MLAG256

Answer: (C)

In a VSX pair, the inter-switch link is implemented as a LAG (the ISL) that carries traffic between the two switches. To allow a specific VLAN to traverse that pair, you must permit that VLAN on the inter-switch-link trunk. So configuring VLAN 100 as allowed on the inter-switch-link LAG256 enables VLAN 100 traffic to cross the VSX pair (via the ports that form that LAG, such as 1/45 and 2/45). This is the correct approach because it directly controls which VLANs are carried across the ISL. The other options don’t fit because they either apply the VLAN to the wrong interfaces (individual access ports rather than the inter-switch LAG), use a different syntax that doesn’t configure the ISL trunk properly, or reference a non-applicable concept (MLAG) for this VSX inter-switch link.

In a VSX pair, the inter-switch link is implemented as a LAG (the ISL) that carries traffic between the two switches. To allow a specific VLAN to traverse that pair, you must permit that VLAN on the inter-switch-link trunk. So configuring VLAN 100 as allowed on the inter-switch-link LAG256 enables VLAN 100 traffic to cross the VSX pair (via the ports that form that LAG, such as 1/45 and 2/45). This is the correct approach because it directly controls which VLANs are carried across the ISL.

The other options don’t fit because they either apply the VLAN to the wrong interfaces (individual access ports rather than the inter-switch LAG), use a different syntax that doesn’t configure the ISL trunk properly, or reference a non-applicable concept (MLAG) for this VSX inter-switch link.