How to use 2 different FW ports to access to 2 different Internet providers

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To forward packets, the FW looks up the routing table and forwards the packets based on the destination address. This mechanism provides only the destination address-based forwarding service, but not differentiated service.
Using PBR, the FW selects routes based on the customized policies but not the routing table and forwards packets based on attributes, such as the incoming interface, source security zone, source and destination IP addresses, user, service type, and application type. This adds flexibility to packet forwarding control. PBR takes priority over, but does not take place of the routing table mechanism. PBR provides guidance for forwarding the traffic of certain services.

Other related questions:
What are the differences in APs' Layer 2 and Layer 3 access to ACs
- In Layer 2 access mode, an AP broadcasts a probe frame to discover ACs. - In Layer 3 access mode, an AP discovers ACs using DHCP Option 43 or DNS. a) When Option 43 is used, an AP obtains an AC's IP address when the AP obtains its own IP address. Then

Difference between forwarding modes of Layer 2 multicast on an S series switch
After Layer 2 multicast is enabled on an S series switch, the switch maintains a Layer 2 multicast forwarding table. When receiving a multicast packet, the switch matches the multicast address of the packet with multicast forwarding entries to determine the outbound interface. Whether the switch determines the outbound interface based on the multicast IP address or multicast MAC address depends on the configured Layer 2 multicast forwarding mode. Multiple multicast IP addresses may be mapped to one MAC address. If multicast data is forwarded based on the MAC address, multicast data may be sent to the users who do not order the multicast data. MAC address-based multicast forwarding can improve specifications in certain scenarios. Different models support different Layer 2 multicast forwarding modes: - The S1720, S2700SI, S2710SI, S2700EI, S2720, S2750EI, S5700S-LI, and S5700LI support only MAC address-based multicast forwarding. - The S3700SI and S5710-C-LI support only IP address-based multicast forwarding. - The S5700SI supports only IP address-based multicast forwarding in V200R002 and earlier versions, and supports MAC address-based and IP address-based forwarding modes starting from V200R003. - The S3700EI, S3700HI, S5710-X-LI, S5720S-SI, S5720SI, S5700EI, S5710EI, S5720EI, S5700HI, S5710HI, S5720HI, S6700EI, S6720EI, S7700, S9700, S12700, S9300, and E600 support MAC address-based and IP address-based forwarding modes.

Can S series switches enabled with SNMP support specifying different source ports based on trap types
For S series switches (except S1700), the snmp-agent trap source command can be executed to specify the source port type and number for sending SNMP traps sent from one server. The system specifies the IP address of the port as the source IP address of traps. However, different port numbers cannot be specified to different types of traps.

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