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138 IBM 9077 SP Switch Router: Get Connected to the SP Switch
of this address to slot 64 in the file /etc/grlamap.conf indicates the IP
connection to the receiving media card and causes it to read the IP header.
The logical address
0xfc0 is preset as a default in the logical address table.
This logical address maps to the nonexistent slot 64. HIPPI cards are
programmed to accept a connection and extract the destination IP address
from the first datagram’s header when they look up an address that points to
slot 64.
A site can set any logical address to designate an IP connection if it maps this
address to destination slot 64 in the /etc/grlamap.conf file. As noted, the
address
0xfc0 is preset in this file.
4.5.1.10 Using the IP Address
The receiving HIPPI card looks up the destination IP address in the routing
table, finds the corresponding GRF output media card, and forwards the
datagram across the crosspoint switch to it.
The output media card just forwards the data
unless
it is a HIPPI card
connected to a HIPPI switch. In this case, the output HIPPI card needs an
I-field to forward when it requests a HIPPI connection to the switch. You need
to supply the I-field by editing the /etc/grarp.conf file.
4.5.1.11 HIPPI in a Bridging Environment
HIPPI does not bridge!
On the GRF, you can route IP to a bridge group from a
HIPPI routing domain, but there is no encapsulated bridging across a HIPPI
connection.
4.5.1.12 MTU
The HIPPI MTU is 65280 bytes. A smaller MTU can be specified in the
/etc/grifconfig.conf file in the arguments field.
4.5.1.13 ARP
HIPPI ARP tables for remote devices connected to GRF HIPPI interfaces are
manually
configured. Entries in the /etc/grarp.conf file map an IP address to a
32bit HIPPI I-field.
4.5.2 HIPPI Configuration Options
GRF Configuration Guide 1.4,
GA22-7366
gives examples how to set up
various configurations by programming a HIPPI media card and, when
necessary, a HIPPI host I-field. Most of them deal with HIPPI to HIPPI
configurations. HIPPI IPI-3 and the IBM HIPPI connection option, H0 HIPPI,
are covered, too.