Intel IXP1200 manual Enetrouteadd, Rtentinfo, Routedelete, Rthelp, IP Route Table Entry

IXP1200 Network Processor Family ATM OC-3/12/Ethernet IP Router Example Design

4.3.3.4enet_route_add()

Adds a route with Ethernet destination to the route table.

enet_route_add(char *dest, char *netmask, char *gateway, int itf, int

gateway_da_hi32, int gateway_da_lo16,int gateway_sa_hi16, int gateway_sa_lo32)

Parameter	Description
char *dest	String IP destination, e.g. "1.1.1.1"
char *netmask	String netmask, e.g., "255.255.0.0"
char *gateway	String next hop gateway, e.g., "255.255.0.0"
int itf	Physical interface id (outputport number).
int gateway_da_hi32	High 32 bits of the MAC destination address.
int gateway_da_lo16	Low 16 bits of the MAC destination address.
int gateway_sa_hi16	High 32 bits of the MAC source address.
int gateway_sa_lo32	Low 16 bits of the MAC source address.

4.3.3.5rt_ent_info()

Displays the available route table information for a given destination address.

rt_ent_info(char *destination)

Parameter	Description
destination	The destination address, in dotted decimal form, of the route entry to display.

4.3.3.6route_delete()

Deletes a route from the route table.

route_delete(char *dest, char *netmask)

Parameter	Description
dest	String IP destination, e.g. "1.1.1.1"
netmask	String netmask, e.g., "255.255.0.0"

4.3.3.7rt_help ()

Outputs a list of command line RTM functions.

4.3.4IP Route Table Entry

The IP lookup table entries reside in DRAM. The same table is used for both ATM and Ethernet destinations. The ATM and Ethernet Receive threads call the macro route_lookup() to obtain an index in the route table to the table entry. If the ITF field contains the ATM port type bit (0x80000000), then the entry is interpreted as an ATM destination, otherwise it is an Ethernet destination.

Application Note 37

Modified on: 3/20/02,