Reference Guide

ip unreachables
Enable the generation of internet control message protocol (ICMP) unreachable messages.
C-Series, E-Series, S-Series, Z-Series, S4810
Syntax
ip unreachables
To disable the generation of ICMP messages, use the no ip unreachables command.
Defaults Disabled.
Command Modes INTERFACE
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 8.1.1.0 Introduced on the E-Series ExaScale.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
pre-Version
6.1.1.0
Introduced on the E-Series.
ip vlan-flooding
Enable unicast data traffic flooding on VLAN member ports.
E-Series
Syntax
ip vlan-flooding
To disable, use the no ip vlan-flooding command.
Defaults Disabled.
Command Modes INTERFACE
Command History
Version 8.1.1.0 Introduced on the E-Series ExaScale.
Version 7.4.1.0 Introduced on the E-Series.
Usage
Information
By default, this command is disabled. When enabled, all the Layer 3 unicast routed data traffic
going through a VLAN member port is flooded across all the member ports of that VLAN. There
might be some ARP table entries which are resolved through ARP packets which had Ethernet
MAC SA different from MAC information inside the ARP packet. This unicast data traffic
flooding occurs only for those packets which use these ARP entries.
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