Hello Everybody,
This is one of the Intersting topic and need to understand the Concept of Static routing with Exit Interface and with Next hop IP address.
Let's Start with the two cases we are taking as below:-
1) If you configured static route pointed to next hop IP address, for every destination forwarding router requires only L2 address of next hop IP address to rewrite the L2 frame.
Example: ip route 2.2.2.0 255.255.255.0 10.1.1.2
For routing packet to destination address 2.2.2.2, router requires L2 mac address of 10.1.1.2.
2) If you configured static route point to outgoing interface, forwarding router assume destination address is directly connected to that interface and router will try to find the L2 address of the destination by sending ARP request out of the interface to the destination address in case of Ethernet or looking for a static/dynamic map entry in the mapping table in case of frame-relay.
Example: ip route 2.2.2.0 255.255.255.0 fa0/0
For routing packet to the destination address 2.2.2.2, router assumes host 2.2.2.2 is directly connected to the interface fa0/0 and it requires L2 mac address for 2.2.2.2.
In general, interfaces can be point to point or multi-point. The above mentioned conditions work differently in scenarios of Point to point and multipoint interface.
In point to point interface, by definition two devices are directly connected, so in case if you configure static route pointing to outgoing interface or next hop IP address does not make a difference, router uses L2 address of next hop IP address of interface for routing packet to every destination address.
In multipoint interface, by definition interface can have multiple devices connected to it. So as mention above in point number two, if you configure static route point to next-hop, router need L3 to L2 resolution for each destination prefixes. Ethernet is an example of multi-point interfaces whereas Frame-relay and ATM can be multi-point interface or point to point depending on the configuration.
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This is one of the Intersting topic and need to understand the Concept of Static routing with Exit Interface and with Next hop IP address.
Let's Start with the two cases we are taking as below:-
1) If you configured static route pointed to next hop IP address, for every destination forwarding router requires only L2 address of next hop IP address to rewrite the L2 frame.
Example: ip route 2.2.2.0 255.255.255.0 10.1.1.2
For routing packet to destination address 2.2.2.2, router requires L2 mac address of 10.1.1.2.
2) If you configured static route point to outgoing interface, forwarding router assume destination address is directly connected to that interface and router will try to find the L2 address of the destination by sending ARP request out of the interface to the destination address in case of Ethernet or looking for a static/dynamic map entry in the mapping table in case of frame-relay.
Example: ip route 2.2.2.0 255.255.255.0 fa0/0
For routing packet to the destination address 2.2.2.2, router assumes host 2.2.2.2 is directly connected to the interface fa0/0 and it requires L2 mac address for 2.2.2.2.
In general, interfaces can be point to point or multi-point. The above mentioned conditions work differently in scenarios of Point to point and multipoint interface.
In point to point interface, by definition two devices are directly connected, so in case if you configure static route pointing to outgoing interface or next hop IP address does not make a difference, router uses L2 address of next hop IP address of interface for routing packet to every destination address.
In multipoint interface, by definition interface can have multiple devices connected to it. So as mention above in point number two, if you configure static route point to next-hop, router need L3 to L2 resolution for each destination prefixes. Ethernet is an example of multi-point interfaces whereas Frame-relay and ATM can be multi-point interface or point to point depending on the configuration.
Visit Official Facebook Page:- https://www.facebook.com/Networksbaseline
Discussion Group:- https://www.facebook.com/groups/networksbaseline/
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