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28 Cards in this Set
- Front
- Back
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To change a port between L2 and L3. Enabled is L2, Disabled L3. If in L3 assign an ip address.
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switch(config-if) [no] switchport
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To assign an IP to a logical L3 interface, a Switched Virtual Interface (SVI). The VLAN must be defined and active on the switch before the SVI can be used
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switch(config)# interface vlan [vlan-id] then switch(config-if)# ip address [ip address] [ subnet mask]
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To enable a fallback bridge group and its instance of VLAN-bridge STP. You can configure up to 31 different groups on a switch.
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switch(config)# bridge-group [bridge-group] protocol vlan-bridge
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To add each VLAN in which non routable traffic will be bridged to the appropriate bridge group.
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switch(config-if)# bridge-group [bridge-group]
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To view a summary of all active fallback bridge groups along with their STP states.
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switch# show bridge group
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To display the bridging table contents for a specific fallback bridge group.
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switch# show bridge [bridge group] [verbose]
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To view if in L2 or L3 mode and verify the configuration of a L2 port. Can see if access VLAN or trunking mode and Native VLAN
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switch# show interface [type] [mod/num] switchport
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To see the physical interfaces status and counters.
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switch# show interface [type] [mod/num]
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To see a summary list of all interfaces
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switch# show interface status
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To verify the configuration of a SVI. To show its status (up or down).
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switch# show interface vlan [vlan-id]
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To see a list of all configured VLANS. Each defined VLAN is shown along with the switch ports assigned to it.
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switch# show vlan
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To display the IP-related information about a switch interface.
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switch# show ip interface
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To view a summary table of all the interfaces involved in routing IP traffic.
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switch# show ip interface brief
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To view the entire FIB in table showing prefix, Next Hop (Receive=packets sent to L3 engine, Attached=connected directly to an SVI, IP Address=An adjacent device is available) and interface.
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switch# show ip cef
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To see the FIB table entries for a specific interface or VLAN. Is a table with prefix, next hop and interface
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switch# show ip cef [[type] [mod/num] |vlan [vlan-id]]
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To see the FIB table entries of a exact match for a specific ip prefix address and mask in same table format. Use longer-prefixes to see longer match entries
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switch# show ip cef [prefix IP and mask] [longer-prefixes]
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What does adding detail to any of these commands do.
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See Info in list view, but with extra info like number of times the CEF entry has been updated since table generated (version) and the number of times CEF table has been flushed sand regenerated as a whole (Epoch)
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To display the adjacency table, the L2 next hop MAC. Shows table with adjacency count per interface.
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switch# show adjacency [[type] [mod/num] | vlan [vlan-id]] summary
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To display more info adjacencies in list, including L2 & L3 address and the age of the ARP.
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switch# show adjacency [[type] [mod/num] | vlan [vlan-id]] detail
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To see the glean state, which is when their is no ARP entry because of missing L2 next-hop address.
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switch# show ip cef adjacency glean or switch# show ip cef [prefix IP and mask] detail
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To see the ARP table, so will show if their are no valid ARP entries for an IP address.
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switch# show ip arp [ip address]
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To gauge the drop adjacency activity and reason. Is when packets are dropped because they cant be forwarded normally.
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switch# show cef drop
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To gauge the CEF punt activity and the various punt adjacency reasons. Is when packets must be sent to the L3 engine for further processing.
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switch# show cef not-cef-switched
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Can you assign an IP address to a Etherchannel.
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Yes, but the network address is assigned to the "port-channel" interface, not the individual links within the channel.
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What is used for protocols like IPX or AppleTalk that CEF cant route or switch.
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Fallback routing, were each SVI associated with a VLAN in which non routable protocols are being used is assigned to a bridge group, were packets are bridged transparently.
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How is loop free fallback bridging maintained.
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Inter-bridge STP is used, 1 instance per fallback bridge group). Although doesn't interact with 802.1d STP, it does act similarly. You can configure any of the same priorities or timers, but swap spanning-tree for bridge group [bridge-group]
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What is a CEF Punt
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Is when a packet cant be forwarded or switched by CEF directly because it needs further processing. So is punted to the L3 engine, effectively bypassing CEF for a more involved resolution.
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What is CEF Glean
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Is when MAC (ARP Reply) for next hop is not yet known. The L3 engine must generate an ARP request and wait for a reply before CEF forwarding can continue to the destination.
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