Do PPP links support the IS-IS routing protocol

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

Other related questions:
The USG supports dynamic routing protocols.
The USG2000 & 5000 & 6000 firewall can support or configure all dynamic routing protocols, including RIP, OSPF, IS-IS, and BGP.

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.

Does the LTE cellular interface support PPP
The LTE cellular interface supports PPP. The following physical interfaces also support PPP: - Synchronous or asynchronous serial interface working in synchronous mode (the interface type is the serial interface) - Async interface working in protocol mode - Serial interfaces formed by CE1/PRI or CT1/PRI interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by CE3 or CT3 interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by E1-F or T1-F interfaces, which have the same logical features as synchronous serial interfaces - Serial interfaces formed by E1/T1 channels that are channelized from a CPOS interface, which have the same logical features as synchronous serial interfaces - Cellular interfaces - ISDN BRI interfaces - POS interfaces Note: For LTE cellular interfaces, only the E392 data cards support the link-protocol ppp command.

Which unicast routing protocols and multicast protocols does GRE support
Generic routing encapsulation (GRE) supports the following unicast routing protocols: -Static routing protocols -OSPF -ISIS -RIP -BGP GRE supports protocol independent multicast (PIM), a multicast protocol.

What routing protocols does the S5700SI support
The S5700SI supports static routes, RIP, and RIPng.

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