What Are the Differences Between a Static Route Configured with Only the Next Hop Address and a Static Route Configured with Both the Next Hop Address

Created: Apr 17, 2017 08:39:46Latest reply: Apr 17, 2017 14:55:18 829 2 0 0
What Are the Differences Between a Static Route Configured with Only the Next Hop Address and a Static Route Configured with Both the Next Hop Address and Outbound Interface?
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user_2790689     Created Apr 17, 2017 14:22:39 Helpful(0) Helpful(0)

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Adamcolob  Visitor   Created Apr 17, 2017 14:55:18 Helpful(0) Helpful(0)

When configuring a static route, you can specify either the next hop address or outbound interface for the static route. Actually, every routing entry requires a next hop address. This is because before sending a packet, a device first searches the routing table for a route matching the destination address of the packet. The device can find the associated link layer address to forward the packet only when the next hop address of the route is specified.

For a point-to-point interface, the next hop address is specified after the outbound interface is specified. That is, the address of the remote interface is the next hop address. For example, the link-layer protocol of a POS interface is the Point-to-Point protocol (PPP). The remote IP address is obtained through PPP negotiation. You need to specify the outbound interface rather than the next hop address.

Non-Broadcast Multiple-Access (NBMA) interfaces are applicable to Point-to-Multipoint networks. Therefore, you need to configure IP routes and the mappings between IP addresses and link layer addresses. In this case, the next hop IP addresses of routes need to be configured.

For an Ethernet interface, the next hop address of a static route must be specified. This is because the Ethernet interface is a broadcast interface and is associated with multiple next hop addresses for the same outbound interface. The next hop thus fails to be identified.

Therefore, if the broadcast interface (such as an Ethernet interface) or NBMA interface must be specified as the outbound interface of a route, you must specify the next hop address of the route.

A static route configured with only the next hop address can participate in route selection only after the next hop iteration is successful. Otherwise, the static route cannot be preferred. A static route configured with both the next hop address and the outbound interface, however, can directly participate in route selection. Only the preferred static route is delivered to the FIB table to guide packet forwarding.
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