Administrator Guide
Clearing IPv6 Routes
To clear routes from the IPv6 routing table, use the following command.
• Clear (refresh) all or a specic route from the IPv6 routing table.
EXEC mode
clear ipv6 route {* | ipv6 address prefix-length}
– *: all routes.
– ipv6 address: the format is x:x:x:x::x.
– mask: the prex length is from 0 to 128.
NOTE: IPv6 addresses are normally written as eight groups of four hexadecimal digits, where each group is separated by a
colon (:). Omitting zeros is accepted as described in Addressing.
Disabling ND Entry Timeout
When a peer system warmboots or performs an ISSU, the ND entries in the local system may time out resulting in trac loss. You can
congure the system to keep the learnt neighbor discovery entries stateless so that the ND entries do not time out. To congure the
system to keep the learnt neighbor discovery entries stateless, follow these steps:
• Disable the ND timer:
INTERFACE
ipv6 nd disable-reachable-timer
• To reenable the ND timer, use the no form of the command:
INTERFACE
no ipv6 nd disable-reachable-timer
The following example shows how to disable the ND timer.
Dell(conf-if-fo-1/1/1)#ipv6 nd disable-reachable-timer
Conguring IPv6 RA Guard
The IPv6 Router Advertisement (RA) guard allows you to block or reject the unwanted router advertisement guard messages that arrive at
the network device platform.
To congure the IPv6 RA guard, perform the following steps:
1 Congure the terminal to enter the Global Conguration mode.
EXEC Privilege mode
configure terminal
2 Enable the IPv6 RA guard.
CONFIGURATION mode
ipv6 nd ra-guard enable
3 Create the policy.
POLICY LIST CONFIGURATION mode
ipv6 nd ra-guard policy policy-name
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IPv6 Routing