User's Manual
484
As to the direct-connecting routing, the next hop is CPU. If the next hop is a routing interface
not an IP address, do as in the direct-connecting routing.
When the number of the routing items in the system is bigger than that of the IP hardware
subnet routing items, the default routing cannot be the IP hardware subnet routing. Two or
several routes, which are prefix to each other, must be used together when IP hardware
subnet routing is adopted. For other items, advise to add heavy-traffic items to the hardware
subnet routing table. Our 3224 series switches support 15 hardware subnet routes, including
the default subnet route.
The ARP of the next-hop IP address does not exist, the system will send an ARP request
and temporarily designate the next-hop routing item as CPU. After the system receives the
ARP response, the system then update the next hop to the user-designating address. If the
VLAN interface where the next hop resides is found different from the configured interface
during the ARP response, the next hop of the route is designated as CPU. Users then need
to correct the configuration.
If the next-hop interface or the interface protocol does not exist, the item will not be added
to the hardware subnet routing table.
Suppose a switch has the following routing items:
(9) 192.168.0.0/16 next hop 192.168.26.3/vlan1
(10) 192.168.20.0/24 next hop 192.168.26.1/vlan1
(11) 192.168.1.0/24 direct-connecting routing
(12) 192.168.26.0/24 direct-connecting routing
(13) 10.0.0.0/8 next hop 192.168.1.4/vlan2
(14) 0.0.0.0/0 next hop 192.168.1.6/vlan2
The destination subnet of route item 1 is the prefix of subnet 2, 3 and 4. Therefore,these items
should be added to the hardware subnet routing table together. Item 3 and 4 are direct-connecting
routing and the next hop is CPU.
The relative configuration is as follows:
ip exf 192.168.20.0 255.255.255.0 nexthop 192.168.26.1 vlan 1
ip exf 192.168.1.0 255.255.255.0 cpu
ip exf 192.168.26.0 255.255.255.0 cpu
ip exf 192.168.0.0 255.255.0.0 nexthop 192.168.26.3 vlan 1
ip exf 10.0.0.0 255.0.0.0 nexthop 192.168.1.4 vlan 2
ip exf 0.0.0.0 0.0.0.0 nexthop 192.168.1.6 vlan 2