Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare Switching Configuration Guide
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Configuring IP parameters
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Syntax: show ip route
Enabling hardware forwarding of IP option packets
based on Layer 3 destination
The IP option field in an IP header is variable in length. A packet can have zero or more options and
an option can have either of the following forms:
•
a single octet of option-type
•
an option-type octet, an option-length octet, and option-data octets
The option-type octet consists of the following three fields:
•
1 bit copied flag
•
2 bits option class
•
5 bits option number
By default, IP option packets are sent to the CPU for forwarding. When configured on a physical
interface, the ignore-options command directs the device to ignore all options in IP option packets
that are received at the configured port. These packets are then treated as if there were no options
configured and forwarded based on their Layer-3 destination. The ignore-options command is
configured as shown in the following.
Brocade(config)# interface ethernet 1/1
Brocade(config-if-e1000-1/1)# ignore-options
Syntax: [no] ignore-options
This command only applies to IP option packets in the default VRF.
When the ignore-options command is configured on a port, RSVP router alert packets incoming on
that port will not be sent to the CPU. Consequently, MPLS should not be configured on a physical
port where the ignore-options command is configured.
Using the ignore-options command in a LAG configuration
The ignore-options command can be used on a LAG but it must apply to all ports on the LAG. This
applies to both static and LACP LAGs as described in the following:
Configuring the ignore-options command on a static LAG
To configure the ignore-options command on a static LAG, each port on the LAG must be configured
with the command. You can do this by configuring the command on each port before the LAG
configuration or configuring the ignore-options command on the primary port of the LAG which
automatically applies the command to all ports on the LAG as shown in the following.
Brocade(config-if-e1000-2/5)# show ip route
Total number of IP routes: 21
Destination Gateway Port Cost Type Uptime
1 10.2.2.2/31 DIRECT eth 1/5 0/0 D 2h19m
2 10.4.4.4/31 DIRECT eth 1/5 0/0 D 2h19m
3 10.25.25.254/31 DIRECT ve 10 0/0 D 2h25m
4 10.168.32.0/31 DIRECT ve 10 0/0 D 2h25m