9-4 S
UMMIT
S
WITCH
I
NSTALLATION
AND
U
SER
G
UIDE
IP U
NICAST
R
OUTING
A static route must be associated with a valid IP subnet. An IP subnet is associated with
a single VLAN by its IP address and subnet mask. If the VLAN is subsequently deleted,
the static route entries using that subnet must be deleted manually.
M
ULTIPLE
R
OUTES
When there are multiple, conflicting choices of a route to a particular destination, the
router picks the route with the longest matching network mask. If these are still equal,
the router picks the route using the following criterion (in the order specified):
• Directly attached network interfaces
• ICMP redirects (refer to Table 9-3)
• Static routes
• Directly attached network interfaces that are not active.
If you define multiple default routes, the route that has the lowest metric is used.
If there are multiple default routes that have the same lowest metric, the Summit
picks one of the routes.
You can also configure blackhole routes—traffic to these destinations is silently dropped.
P
ROXY
ARP
Proxy ARP was first invented so that ARP-capable devices could respond to ARP
Request packets on behalf of ARP-incapable devices. The usage and scope of proxy
ARP has been expended since its introduction. Currently, proxy ARP can be used to
achieve router redundancy and simplify IP client configuration. The Summit switch
supports proxy ARP for this type of network configuration. Up to 64 proxy ARP entries
can be configured. The section describes some example of how to use proxy ARP with
the Summit.
ARP-I
NCAPABLE
D
EVICES
To configure the Summit to respond to ARP Requests on behalf of devices that are
incapable of doing so, you must configure the IP address and MAC address of the
ARP-incapable device using the use the following command:
config iparp add proxy <ipaddress> {<mask>} <mac_address> {always}
Summit.bk : 9ROUT.FM Page 4 Thursday, June 18, 1998 9:27 AM
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