The USG supports dynamic routing protocols.

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The USG2000 & 5000 & 6000 firewall can support or configure all dynamic routing protocols, including RIP, OSPF, IS-IS, and BGP.

Other related questions:
Dynamic routing protocols supported by an AR
Besides static routing protocols, ARs also support dynamic routing protocols such as the Routing Information Protocol (RIP), Open Shortest Path First (OSPF), Intermediate System to Intermediate System (IS-IS), and Border Gateway Protocol (BGP). Routes that are discovered by dynamic routing protocols are called dynamic routes.

USG firewall routing protocol priority.
The priority of the USG2000 & 5000 & 6000 routing protocol is as follows: - The default priority of static routes is 60 - The default cost of the direct route cost is 0 - The default priority of RIP is 100 - When OSPF defaults to 10, the default priority is 150 - The IS-IS route defaults to 15 - BGP has three routes: 1. The default route (EBGP) learned from external peers is 255 2. The route learned from the internal peer (IBGP) defaults to 255 3. The local route defaults to 255 The smaller the value above, the more priority.

S series switches' support for routing
For details about routing features supported by S series switches of different models: - S12700: See "IP Unicast Routing" in S12700 Product Use Precautions. - S7700 and S9700: See "IP Unicast Routing" in S7700&S9700 Product Use Precautions. - S9300: See "IP Unicast Routing" in S9300&S9300E&S9300X Product Use Precautions. - S1720, S2700, S3700, S5700, and S6700: See "IP Unicast Routing" in S1720&S2700&S3700&S5700&S6700 Product Use Precautions. - S600: See "IP Unicast Routing" in S600-E Product Use Precautions.

Modifying the routing protocol priority on the firewall
The method for modifying the routing protocol priority on the USG2000&5000&6000 is as follows: -Modifying the static routing protocol priority: [USG]ip route-static 192.168.0.0 16 10.1.1.1 preference 20 -Modifying the RIP priority: [USG]rip [USG-rip-1]preference 80 -Modifying the OSPF priority: [USG]ospf [USG-ospf-1]preference 30 -Modifying the IS-IS priority: [USG]isis [USG-isis-1]preference 90 -Modifying the BGP priority: [USG]bgp 25212 [USG-bgp]ipv4-family unicast [USG-bgp-af-ipv4]preference 120

Do PPP links support the IS-IS routing protocol
Yes, PPP links support the IS-IS routing protocol.

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