ip route
Within the config context:
Syntax
ip route <IP-ADDR/MASK-LENGTH> blackhole logging
ipv6 route <IPV6-ADDR/MASK-LENGTH> blackhole logging
Description
Configures the debug logging for a static blackhole route for either IPv4 or IPv6.
Options
- logging
Allows the packets received on the blackhole route to be logged. When logging is enabled on the switch for blackhole routes, the debug logs are sent to the configured destination. The destination can be a logging server, a buffer, or even the switch itself.
Usage
no ip route <IP-ADDR/MASK-LENGTH> blackhole
no ipv6 route <IP-ADDR/MASK-LENGTH> blackhole
Disables the logging facility for the configured blackhole routes.
The
form of the command does not have the logging option.
Debug Logs
The following debug message will be logged after a blackhole route logging is enabled.
Packet destined blackhole route with Source Ip =<IP ADDRESS>, Destination IP=<DESTINATION IP>, VLAN Interface = <VLAN INTERFACE>, Lport = <PORT ID>
No debug messages for blackhole route will be logged after a blackhole route logging is disabled.
ip route 20.20.20.2/32 blackhole logging
Enable debug logging for a blackhole route with destination IP address.
Switch(config)# ip route 20.20.20.2/32 blackhole logging
ipv6 route 2001::2/128 blackhole logging
Enable debug logging for a blackhole route with destination IPv6 address.
switch(config)# ipv6 route 2001::2/128 blackhole logging
no ip route 20.20.20.2/32 blackhole
Disable debug logging for the blackhole route with destination IP address 20.20.20.2.
switch(config)# no ip route 20.20.20.2/32 blackhole
no ipv6 route 2001::2/128 blackhole
Disable debug logging for the blackhole route with destination IPv6 address
switch(config)#no ipv6 route 2001::2/128 blackhole
ip route 20.20.20.0/24 blackhole logging
Enable debug logging for IPv4 blackhole route 20.20.20.0
Switch(config)# ip route 20.20.20.0/24 blackhole logging
ipv6 route 2001::/64 blackhole logging
Enable debug logging for IPv6 blackhole route.
switch(config)#ipv6 route 2001::/64 blackhole logging