Chapter 25
| IP Interface Commands
IPv6 Interface
– 565 –
ping6 This command sends (IPv6) ICMP echo request packets to another node on the
network.
Syntax
ping6 {ipv6-address | host-name} [count count] [size size]
ipv6-address - The IPv6 address of a neighbor device. You can specify either
a link-local or global unicast address formatted according to RFC 2373 “IPv6
Addressing Architecture,” using 8 colon-separated 16-bit hexadecimal
values. One double colon may be used in the address to indicate the
appropriate number of zeros required to fill the undefined fields.
host-name - A host name string which can be resolved into an IPv6 address
through a domain name server.
count - Number of packets to send. (Range: 1-16)
size - Number of bytes in a packet. (Range: 48-18024 bytes)
The actual packet size will be eight bytes larger than the size specified
because the router adds header information.
Default Setting
count: 5
size: 100 bytes
Command Mode
Privileged Exec
Command Usage
◆ Use the ping6 command to see if another site on the network can be reached,
or to evaluate delays over the path.
◆ The same link-local address may be used by different interfaces/nodes in
different zones (RFC 4007). Therefore, when specifying a link-local address,
include zone-id information indicating the VLAN identifier after the % delimiter.
For example, FE80::7272%1 identifies VLAN 1 as the interface from which the
ping is sent.
◆ When pinging a host name, be sure the DNS server has been enabled (see
page 524). If necessary, local devices can also be specified in the DNS static host
table (see page 526).
◆ When using ping6 with a host name, the router first attempts to resolve the
alias into an IPv6 address before trying to resolve it into an IPv4 address.
Example
Console#ping6 FE80::2E0:CFF:FE00:FC%1/64
Type ESC to abort.
PING to FE80::2E0:CFF:FE00:FC%1/64, by 5 32-byte payload ICMP packets,
timeout is 3 seconds
response time: 20 ms [FE80::2E0:CFF:FE00:FC] seq_no: 1
response time: 0 ms [FE80::2E0:CFF:FE00:FC] seq_no: 2
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