Crypto ipsec profile lifetime

Run system-view The system view is displayed. By default, the global time-based SA hard lifetime is seconds and the global traffic-based SA hard lifetime is Kbytes. Run ipsec policy-template template-name seq-number An IPSec policy template is created and the IPSec policy template view is displayed. This will cause IPSec traffic interruption. In this case, it is recommended to perform this step on the local device. The default is 4,, kilobytes.

Defaults seconds one hour and 4,, kilobytes 10 megabits per second for one hour. These keys and their security associations time out together. Assuming that the particular crypto map entry does not have lifetime values configured, when the router requests new security associations during security association negotiation, it will specify its global lifetime value in the request to the peer; it will use this value as the lifetime of the new security associations.

When the router receives a negotiation request from the peer, it will use the smaller of the lifetime value proposed by the peer or the locally configured lifetime value as the lifetime of the new security associations. There are two lifetimes: a "timed" lifetime and a "traffic-volume" lifetime. The security association expires after the first of these lifetimes is reached.

If you change a global lifetime, the change is only applied when the crypto map entry does not have a lifetime value specified. The change will not be applied to existing security associations, but will be used in subsequent negotiations to establish new security associations. If you want the new settings to take effect sooner, you can clear all or part of the security association database by using the clear crypto sa command.

Refer to the clear crypto sa command for more details. To change the global timed lifetime, use the crypto ipsec security-association lifetime seconds form of the command. The timed lifetime causes the security association to time out after the specified number of seconds have passed.

To change the global traffic-volume lifetime, use the crypto ipsec security-association lifetime kilobytes form of the command.

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Dynamic crypto map entries, like regular static crypto map entries, are grouped into sets. After you define a dynamic crypto map set which commonly contains only one map entry using this command, you include the dynamic crypto map set in an entry of the "parent" crypto map set using the crypto map IPSec global configuration command. The parent crypto map set is then applied to an interface.

You should make crypto map entries referencing dynamic maps the lowest priority map entries, so that negotiations for security associations will try to match the static crypto map entries first. Only after the negotiation request does not match any of the static map entries do you want it to be evaluated against the dynamic map. To make a dynamic crypto map the lowest priority map entry, give the map entry referencing the dynamic crypto map the highest seq-num of all the map entries in a crypto map set.

For both static and dynamic crypto maps, if unprotected inbound traffic matches a permit statement in an access list, and the corresponding crypto map entry is tagged as "IPSec," then the traffic is dropped because it is not IPSec-protected. This is because the security policy as specified by the crypto map entry states that this traffic must be IPSec-protected. For static crypto map entries, if outbound traffic matches a permit statement in an access list and the corresponding security association SA is not yet established, the router will initiate new SAs with the remote peer.

In the case of dynamic crypto map entries, if no SA existed, the traffic would simply be dropped because dynamic crypto maps are not used for initiating new SAs. Note Use care when using the any keyword in permit entries in dynamic crypto maps. If it is possible for the traffic covered by such a permit entry to include multicast or broadcast traffic, the access list should include deny entries for the appropriate address range.

Access lists should also include deny entries for network and subnet broadcast traffic, and for any other traffic that should not be IPSec protected. Examples The following example configures an IPSec crypto map set. Crypto map entry "mymap 30" references the dynamic crypto map set "mydynamicmap," which can be used to process inbound security association negotiation requests that do not match "mymap" entries 10 or In this case, if the peer specifies a transform set that matches one of the transform sets specified in "mydynamicmap," for a flow "permitted" by the access list , IPSec will accept the request and set up security associations with the remote peer without previously knowing about the remote peer.

If accepted, the resulting security associations and temporary crypto map entry are established according to the settings specified by the remote peer. The access list associated with "mydynamicmap 10" is also used as a filter. There are two lifetimes: a "timed" lifetime and a "traffic-volume" lifetime.

The SA expires after the first of these lifetimes is reached. If you change a global lifetime, the change is not applied to existing SAs, but is used in subsequent negotiations to establish new SAs. If you want the new settings to take effect sooner, clear all or part of the SA database by using the clear crypto ipsec sa command. To change the global timed lifetime, use the crypto ipsec security-association lifetime seconds form of the command.

The timed lifetime causes the SA to time out after the specified number of seconds have passed. To change the global traffic-volume lifetime, use the crypto ipsec security-association lifetime kilobytes form of the command. The traffic-volume lifetime causes the SA to time out after the specified amount of traffic in KB has been protected by the key of the SAs.

Shorter lifetimes can make mounting a successful key recovery attack more difficult because the attacker has less data encrypted under the same key with which to work. How These Lifetimes Work The SA and corresponding keys expire according to whichever occurs sooner, either after the number of seconds has passed specified by the seconds keyword or after the amount of traffic in KB has passed specified by the kilobytes keyword.

A new SA is negotiated before the lifetime threshold of the existing SA is reached to ensure that a new SA is ready for use when the old one expires.

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