User`s guide

Reviewing and Configuring Router Interfaces
7-6 Configuring IP
ThisexampleshowshowtousetheshowipinterfacecommandtodisplayIPconfiguration
informationforVLAN1,includingadministrativestatus,IPaddress,MTU(Maximum
TransmissionUnit)sizeandbandwidth,andACLconfigurations.Table 7‐3providesadetailed
descriptionofthecommandoutput:
Matrix>Router1#show ip interface vlan 1
Vlan 1 is Admin UP
Vlan 1 is Oper UP
IP Address 81.81.7.3 Mask 255.255.255.128
Frame Type ARPA
MAC-Address 0001.f4da.16ee
Incoming Access List is not Set
Outgoing Access List is not Set
IP Helper Address is not Set
MTU is 1500 bytes
ARP Timeout is 14400 seconds
Proxy Arp is Enabled
ICMP Re-Directs are enabled
ICMP Unreachables are always sent
ICMP Mask Replies are always sent
Policy routing enabled, route map 101
Table 7-3 show ip interface Command Output
Output What It Displays...
Vlan | Lpbk N Whether the interface is administratively and operationally up or down.
IP Address Interface’s IP address and mask. Set using the ip address command as
described in “Assigning an IP Address” on page 7-7.
Frame Type Encapsulation type used by this interface. ARPA is the device default, and
cannot be changed.
MAC-Address MAC address mapped to this interface. Set using the ip mac-address
command as described in “Assigning a MAC Address to an Interface” on
page 7-14.
Incoming | Outgoing
Access List
Whether or not an access control list (ACL) has been configured on this
interface.
IP Helper Address Whether or not an IP address has been designated for forwarding UDP
datagrams from this interface. Set using the ip helper-address command as
described in “Enabling or Disabling UDP Broadcast Forwarding” on page 7-15.
MTU Interface’s Maximum Transmission Unit size.
ARP Timeout Duration for entries to stay in the ARP table before expiring. Default of 14,400
seconds can be modified using the arp timeout command as described in
“Changing the ARP Timeout” on page 7-14.
Proxy Arp Whether or not proxy ARP is enabled or disabled for this interface. Default state
of enabled can be modified using the ip proxy arp command as described in
“Disabling or Re-enabling Proxy ARP on an Interface” on page 7-14.
ICMP ICMP (ping) settings. By default, ICMP messaging is enabled on a routing
interface for both echo-reply and mask-reply modes. If, for security reasons,
ICMP has been disabled, it can be re-enabled using the ip icmp command as
described in “Enabling or Disabling ICMP” on page 7-18.
Policy routing Whether or not policy-based routing has been configured on this interface.