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Discard ::/127

hfakoor222
Participant
Participant

My output from sh ipv6

 


::/0
no route
::/127
discard
2001:DB8:ACAD:1001::/64
attached to GigabitEthernet0/0
2001:DB8:ACAD:1001::2/128
receive for GigabitEthernet0/0
FE80::/10
receive for Null0
FF00::/8
multicast

 

 

 

what means ::/127 discard? everything up to ::/127 not defined 

 

 

in

 

2001:DB8:ACAD:1001::/64
attached to GigabitEthernet0/0
2001:DB8:ACAD:1001::2/128
receive for GigabitEthernet0/0

 

 

 

gets discarded?

1 Accepted Solution

Accepted Solutions

dsf;s.png

The IP address ::/127 is called a loopback address. Packets sent to this address never reach the network but are looped through the network interface card only.

View solution in original post

2 Replies 2

dsf;s.png

The IP address ::/127 is called a loopback address. Packets sent to this address never reach the network but are looped through the network interface card only.

Harold Ritter
Cisco Employee
Cisco Employee

Hi @hfakoor222 ,

 

According to RFC4291, ::/128 is the unspecified IPv6 address and ::1/128 (equivalent to ipv4 0.0.0.0) is the loopback address (equivalent to IPv4 127.0.0.1). "::/127 discard" means that IOS will discard any packets destined to either addresses.

 

For more information about ::/128 or ::1/128 please refer to RFC4291.

 

https://datatracker.ietf.org/doc/html/rfc4291

 

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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