1. Question: VRRP is configured as a DHCP address pool backup.
Answer: When doing a DHCP address pool in the VRRP, please be careful to configure the same address pool on both sides and then implement backup by setting the address exclusion.
2. Question: Turn off MAC address learning on the SVI interface?
Answer: Mac address learning function, physical port and full can not be disabled under SVI interface. On the configuration, the command is: no mac-address learning
3. Question: How does the switch source in and source out?
Answer: It can be partially implemented by means of policy routing (PBR), and the switch itself cannot make source and source.
4. Problem: Set again the dhcp snooping but does not set the trust environment, can the SVI interface obtain the address?
Answer: Set again the dhcp snooping but does not set the trust environment, the SVI itself can get the address (such as the access switch has an SVI 20, the core address pool is also vlan 20), even if there is no trust, vlan 20 can also obtain the address. Because snooping is forbidden at the forwarding level, there is no control layer.
5. Question: Can the switch do NAT?
Answer: Currently, the switch does not support port mapping, except for chassis switches with firewall line cards.
6 Question: How many source ports can I configure for port mirroring?
Answer: There is no limit to the number of source interfaces for port mirroring but the session of port mirroring is limited. The number of different switches is inconsistent.
7. Question: Can't POE power the AP?
Answer: The POE on the switch is powered by 1236. but the AP needs to be powered by 4578. So the POE cannot supply power to the AP.
8. Question: How do I restart the OSPF process?
Answer: Restart OSPF :switch# clear ip ospf process Some versions cannot be supported. You can only reset the process ID by deleting the configuration.
9. Question: Does OSPF redistribution not import all routing entries?
Answer: When OSPF redistributes routes, you need to configure the subnets parameter. If not configured, only the primary route (A/B/C) will be advertised. The subnet detailed routes will not be advertised to neighbors.
For example: router ospf 65301
Redistribute ospf 110 Subnets
10. Question: Is OSPF redistribution calling ACL unsuccessful?
Answer: OSPF route redistribution can not directly call ACL and can only use ACL to indirectly invoke route filtering through route-map.
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