Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 268)

250 Brocade ICX 6650 Layer 3 Routing Configuration Guide
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OSPF V3 configuration
Interface and area IPsec considerations
This section describes the precedence of interface and area IPsec configurations.
If you configure an interface IPsec by using the ipv6 ospf authentication command in the context of
a specific interface, that interface’s IPsec configuration overrides the area configuration of IPsec.
If you configure IPsec for an area, all interfaces that utilize the area-wide IPsec (where
interface-specific IPsec is not configured) nevertheles receive an SPD entry (and SPDID number)
that is unique for the interface.
The area-wide SPI that you specify is a constant for all interfaces in the area that use the area
IPsec, but the use of different interfaces results in an SPDID and an SA that are unique to each
interface. (Recall from
“IPsec for OSPF V3” on page 247 that the security policy database depends
partly on the source IP address, so a unique SPD for each interface results.)
Considerations for IPsec on virtual links
The IPsec configuration for a virtual link is global, so only one security association database and
one security policy database exist for virtual links if you choose to configure IPsec for virtual links.
The virtual link IPsec SAs and policies are added to all interfaces of the transit area for the
outbound direction. For the inbound direction, IPsec SAs and policies for virtual links are added to
the global database.
NOTE
The security association (SA), security protocol index (SPI), security protocol database (SPD), and key
have mutual dependencies, as the subsections that follow describe.
Specifying the key rollover timer
Configuration changes for authentication takes effect in a controlled manner through the key
rollover procedure as specified in RFC 4552, Section 10.1. The key rollover timer controls the
timing of the configuration changeover. The key rollover timer can be configured in the IPv6 router
OSPF context, as the following example illustrates.
Brocade(config-ospf6-router)#key-rollover-interval 200
Syntax: key-rollover-interval time
The range for the key-rollover-interval is 0–14400 seconds. The default is 300 seconds.
Configuring IPsec on a interface
For IPsec to work, the IPsec configuration must be the same on all the routers to which an interface
connects.
For multicast, IPsec does not need or use a specific destination address—the destination address
is “do not care,” and this status is reflected by the lone pair of colons (::) for destination address in
the show command output.
To configure IPsec on an interface, proceed as in the following example.