Gateway# ping | Cisco Systems AS5400XM manual

In this example:

•Interface loopback 0—Identifies the universal gateway with a unique and stable IP address. One unique IP address from a common block of addresses is assigned to each device in the IP network. This technique makes security-filtering easy for the Network Operations Center (NOC). One Class C subnet used for device identification can support 254 distinct devices with unique loopback addresses.

•Interface loopback 1—Hosts a pool of IP addresses for the remote nodes. In this way, one route, instead of 254 routes, is summarized and propagated to the backbone. Pick the IP address for loopback 1 from the range of addresses that you will assign to the local address pool.

Step 3 Return to privileged EXEC mode:

Gateway(config)# Ctrl-Z

Gateway#

Step 4 Verify that the Gigabit Ethernet interface is up. Ping the default gateway to verify this.

Gateway# ping 172.28.186.49

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.28.186.49, timeout is 2 seconds:

.!!!!

Success rate is 80 percent (4/5), round-trip min/avg/max = 1/1/4 ms

Tip To save the gateway configuration, save it to NVRAM. See the “Saving Configuration Changes” section on page 60.

Note An 80 percent success rate is normal for the first time you ping an external device. The universal gateway does not have an Address Resolution Protocol (ARP) entry for the external device. A 100 percent success rate is achieved the next time you ping the device.

Configuring the Asynchronous Group Interface

This section shows how to configure asynchronous interfaces. Asynchronous group interfaces allow administrators to easily configure a large number of asynchronous interfaces by allowing them to clone interfaces from one managed copy. This can also reduce the number of lines in the configuration file, because each individual asynchronous interface configuration can be replaced by at least one group-async interface. To assign the asynchronous interfaces to a group-async interface, first determine the number of asynchronous lines that need to be aggregated. This can be determined from the running configuration.

Step 1 Enter the enable command and password to go to privileged EXEC mode. You are in privileged EXEC mode when the prompt changes to Gateway#.

Gateway> enable

Password: password

Gateway#

Step 2 Enter global configuration mode. You are in global configuration mode when the prompt changes to

Gateway(config)#.

Gateway# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Gateway(config)#

Step 3 Place all asynchronous interfaces in a single group, so that you configure the same parameters quickly on all interfaces at one time:

Gateway(config)# interface group-async 1

Gateway(config-if)#