display vlan, display interface brief, and display ip routing-table.To see the VLANs configured on the switch and which ports belong to each VLAN, use:
display vlan – Shows all VLANs and their associated ports on the switch .display interface brief – Provides a summary of all interfaces, their status, and assigned VLANs .display mac-address – Lists MAC addresses learned on each VLAN, helping identify devices in each network segment . For more detailed interface information, including IP addresses and operational status:display interface [interface-name] – Displays detailed information for a specific interface .display ip interface brief – Shows IP addresses assigned to VLANIF interfaces, which represent Layer 3 interfaces for each VLAN .On a core switch configured for Layer 3 routing, each VLAN typically has a VLANIF interface. To view network segments and their routing:
display ip routing-table – Shows routes between VLANs and other network segments .display arp – Helps verify which devices are reachable on each VLAN . If PCs on different VLANs need to communicate, static routes or dynamic routing protocols must be configured on the core switch to enable inter-VLAN communication .To restrict or monitor traffic between network segments, you can configure ACLs:
acl 3001[Switch-acl-adv-3001] rule deny ip source 10.1.1.0 0.0.0.255 destination 10.1.2.0 0.0.0.255[Switch-acl-adv-3001] quit
For a broader view of the network, you can also use:
display lldp neighbor – Shows connected devices and their ports, useful for mapping network segments .
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