Router Management and Information Display

Default IP Routing Parameters lists routing parameters and their default values.

Default IP Routing Parameters

Parameter	Description	Default Value
ARP entry type	Specifies whether an ARP table entry is permanent or temporary.	permanent
ARP retransmit time	Specifies the duration in seconds to wait before retransmitting ARP requests.	1 second
ARP stale entry timeout	Specifies the duration in seconds an ARP entry will remain in the stale state before the entry is removed from the ARP table.	1200 seconds
ARP timeout	Specifies the duration in seconds for temporary ARP entries to stay in the ARP table before expiring (S-, K-Series).	3600 seconds
directed broadcast	The ability to address a destination host such that the arriving packet will be broadcasted to the network as if it was a normal broadcast generated by the receiving host(S-, K-Series).	disabled
equal cost multipath algorithm	Specifies the algorithm used for selecting the next path used by the equal cost multipath feature (S-, K-Series).	hash threshold
global router	Specifies the default router used when configuring the router directly from configuration command mode. The current implementation supports a single global router and up to 128 VRF router instances on the S- and K-Series and up to 16 VRF router instances on the 7100-Series, depending upon the system being configured.	global
gratuitous ARP	A feature that overrides the normal ARP updating process by providing an ARP announcement packet containing valid sender hardware and protocol addresses for the host that sent it.	enabled for ARP replies and ARP requests
gratuitous ARP learning	A feature that allows an interface to learn new ARP bindings using gratuitous ARP.	disabled
IP ICMP echo reply	Specifies whether IPv4 ICMP echo-reply messages are sent (S-, K-Series).	enabled
IP ICMP mask reply	Specifies whether IPv4 ICMP mask reply messages are sent (S-, K-Series).	enabled
IP ICMP redirection	Specifies whether IPv4 ICMP redirect messages are sent (S-, K-Series).	enabled
IP ICMP unreachable	Specifies whether IPv4 ICMP unreachable messages are sent (S-, K-Series).	enabled
IPv4 forwarding	Specifies whether or not the routing interface will forward IPv4 traffic.	enabled (S-, K-Series) disabled (7100-Series)
IPv6 address autoconfiguration	Specifies whether IPv6 addresses are auto configured on the interface.	disabled
IPv6 forwarding	Specifies whether or not the routing interface will forward IPv6 traffic.	disabled
neighbor discovery Duplicate Address Detection (DAD)	Specifies the number of DAD messages neighbor discovery will send out to attempt to determine whether the “tentative” address for this interface is a duplicate of another address in the network.	1 attempt
proxy ARP	A feature that provides for the ability of a device on a given network to answer the ARP queries for a network address that is not on that network.	enabled (no local or default-route)

Managing the Router describes how to manage IP configuration.

Managing the Router

Task	Command
To clear this router configuration:	clear router vrf vrf-name
To delete one or all entries from the ARP table:	clear arp {ip-address \| all}
To delete all non-static (dynamic) entries from the ARP table:	clear arp-cache [ip-address] [interface interface]

Displaying IP Routing Information and Statistics describes how to display IP configuration information and statistics.

Displaying IP Routing Information and Statistics

Task	Command
To display router configuration:	show router [name]
To display the application limits for this router: The vrf option is S- and K-Series.	show limits [vrf vrf] [application application]
To display non-default, user entered configuration, or all configuration for this router: Supported applications can be determined by entering the show running-config ? command.	show running-config [all] [application [all]]
To display configuration information for one or more interfaces:	show interface [interface-name]
To display configuration information for one or more IPv4 routing interfaces:	show ip interface [interface-name] [brief]
To display configuration information for one or more IPv6 routing interfaces:	show ipv6 interface [interface-name [prefix]] [brief]
To display information about IP protocols running on this device:	show ip protocols
To display information about IP routes: The ospf, rip, and static options are S- and K-Series.	show ip route [host [connected \| host-address \| dynamic \| static]] [dest-address [prefix-mask] \| prefix/prefix-length \| connected \| ospf \| rip \| static \| summary]
To display the device‘s ARP table:	show arp [ip-address] [interface interface] [statistics]
To display debug IP packet utility settings:	show debugging
To display debug IP VRRP utility settings (S-, K-Series):	debug ip vrrp show

Published May 2016prev | next

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