This allows the keymanagement system to negotiate a new SA before the hard lifetime expires.IKE version. Here are my Router configuration: crypto isakmp policy 1 … The security association is the method that IPSec uses to track all the particulars concerning a given IPSec communication session. This establishes two one-way SAs between the peers. Displays configuration information about current IP security (IPsec) security associations (SAs).

Each lifetime ofan SA has two display options, hard and soft, one of which must bepresent for a dynamic SA. Each IPSecpeer agrees to set up SAs consisting of policy parameters to be used during theIPSec session. The peer gatewayseach have two SAs, one resulting from each of the two phases of negotiation:Phase 1 and Phase 2.Do you have time for a two-minute survey?The lifetime of the SA, after which it expires, expressedeither in seconds or kilobytes.The tunnel interface to which the route-basedVPN is bound.Size of the antireplay service window, which is 64 bits.If Network Address Translation (NAT) isused, this value is 4500. This allows the key management system tonegotiate a new SA before the hard lifetime expires.Identity of the local peer so that its partnerdestination gateway can communicate with it. A separate pair of IPSec SAs are set up for AH and ESP transform. IPSec provides many options forperforming network encryption and authentication. An SA is uniquelyidentified by an SPI. crypto map CRYPTO-VPN 155 ipsec-isakmp set peer x.x.x.x set security-association lifetime seconds 86400 set transform-set VPN-SET set pfs group2 match address ACL-VPN! Dear All, I have setup ipsec VPN in my C2811 router but when "show crypto isakmp/ipsec sa" shows nothing. A V means that IPSec datapath verification is in progress.Indicates how the IKE is activated.Value of the auxiliary security parameterindex(SPI).Display information about the IPsec security associations(SAs).Configured size of the antireplay servicewindow. Does it indicates that the remote ASA5520 not yet configured? Two-waycommunication consists of two SAs, one for each direction.The concept of a security association (SA) is fundamental to IPSec. The nomenclature gets a little confusing at times, because SAs are used for more than just IPSec. Display information about the IPsec security associations (SAs). ; Up-IDLE – IPSsc SA is up, but there is not data going over the tunnel; Up-No-IKE – This occurs when one end of the VPN tunnel terminates the IPSec VPN and the remote end attempts to keep using the original SPI, this can be avoided by issuing crypto isakmp invalid-spi-recovery Some of the common session statuses are as follows: Up-Active – IPSec SA is up/active and transferring data. Otherwise, it is the standard IKE port,500.Index number of the SA. An SA isa relationship between two or more entities that describes how the entities willuse security services to communicate securely. If there is no lifesize specified, it shows unlimited.An encryption algorithm used to encrypt data traffic.The tunnel interface to which the route-based VPN isbound.The soft lifetime informs the IPsec key management systemthat the SA is about to expire.The antireplay window size protects the receiver against replayattacks by rejecting old or duplicate packets.Security parameter index (SPI) identifier. Otherwise, it is the standard IKE port, 500.The hard lifetime specifies the lifetime of the SA.Indicates the list of parent IKE security associations.For transport mode, the value of State is always Installed.Cryptography used to secure exchanges betweenpeers during the IKE Phase 2 negotiations includes:Help us improve your experience.Cryptography used to secure exchanges between peers duringthe IKE negotiations includes:Tunnel mode supports ESP and AH.The lifetime of the SA, after which it expires,expressed either in seconds or kilobytes.The soft lifetime informs the IPsec keymanagement system that the SA is about to expire. If there is no lifesize specified, it shows unlimited.Security parameter index (SPI) identifier.An SA is uniquely identified by an SPI. After deciding on the algorithms, the two devices must share sessionkeys. NOTE. For example, IKE SAs describe the security parametersbetween two IKE devices.An IPSec transform in Cisco IOS specifies either an AH or an ESP protocol andits corresponding algorithms and mode (transport or tunnel).

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