Chapter 9: AI2524 OSI/CLNP Configuration Steps
August 1997 Page 9-55
2524UM
Set the Congestion Threshold
If a router configured for CLNS experiences congestion, it sets the
congestion-experienced bit. You can set the congestion threshold on a
per-interface basis. By setting this threshold, you cause the system to
set the congestion-experienced bit if the output queue has more than
the specified number of packets in it.
In interface configuration mode, set the congestion threshold:
clns congestion-threshold
number
Transmit Error Protocol Data Units (ERPDUs)
When a CLNS packet is rec eived, the routing software looks in the
routing table for the next hop. If it does not find one, the packet is dis-
carded and an error protocol data unit (ERPDU) is sent.
You can set an interval between ERPDUs. Doing so reduces band-
width if this feature is disabled. When you set the minimum interval
between ERPDUs, the Cisco IOS sof twar e does not send ERPDUs
more frequently than one per interface per ten milliseconds.
In interface configuration mode, transmit ERPDUs:
1. Send an ERPDU when the routing software detects an error in
data PDU; this is enabled by default.
clns send-erpdu
2. Set the minimum interval, in milliseconds, between ERPDUs.
clns erpdu-interval
milliseconds
Control Redirect Protocol Data Units (RDPDUs)
If a packet is sent out the same interface it came in on, a re direct pro-
tocol data unit (RDPDU) also can be sent to the sender of the packet.
You can control RDPDUs with one of these actions:
zBy default, CLNS sends RDPDUs when a better route for a given
host is known. You can disable this feature. Disabling this feature
reduces bandwidth because packets may continue to unnecessarily
go through the router.
clns send-rdpdu
zYou can set the interval times bet we e n RDPDUs.
clns rdpdu-interval
milliseconds
Warning: SNPA masks are never sent, and RDPDUs are ignored by
the Cisco IOS software when the router is acting as an IS.