Invalid Security Parameter Index Recovery

First Published: July 28, 2003
Last Updated: July 31, 2009

When an invalid security parameter index error (shown as "Invalid SPI") occurs in IP Security (IPsec) packet processing, the Invalid Security Parameter Index Recovery feature allows for an Internet Key Exchange (IKE) security association (SA) to be established. The "IKE" module sends notification of the "Invalid SPI" error to the originating IPsec peer so that Security Association Databases (SADBs) can be resynchronized and successful packet processing can be resumed.

Finding Feature Information

For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for Invalid Security Parameter Index Recovery" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS XE software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp. An account on Cisco.com is not required.

Contents

•Prerequisites for Invalid Security Parameter Index Recovery

•Restrictions for Invalid Security Parameter Index Recovery

•Information About Invalid Security Parameter Index Recovery

•How to Configure Invalid Security Parameter Index Recovery

•Configuration Examples for Invalid Security Parameter Index Recovery

•Additional References

•Feature Information for Invalid Security Parameter Index Recovery

Prerequisites for Invalid Security Parameter Index Recovery

Before configuring the Invalid Security Parameter Index Recovery feature, you must have enabled IKE and IPsec on your router.

Restrictions for Invalid Security Parameter Index Recovery

If an IKE SA is being initiated to notify an IPsec peer of an "Invalid SPI" error, there is the risk that a denial-of-service (DoS) attack can occur. The Invalid Security Parameter Index Recovery feature has a built-in mechanism to minimize such a risk, but because there is a risk, the Invalid Security Parameter Index Recovery feature is not enabled by default. You must enable the command using command-line interface (CLI).

Information About Invalid Security Parameter Index Recovery

To use the Invalid Security Parameter Index Recovery feature, you should understand the following concept.

•How the Feature Works

How the Feature Works

An IPsec "black hole" occurs when one IPsec peer "dies" (for example, a peer can "die" if a reboot occurs or if an IPsec peer somehow gets reset). Because one of the peers (the receiving peer) is completely reset, it loses its IKE SA with the other peer. Generally, when an IPsec peer receives a packet for which it cannot find an SA, it tries to send an IKE "INVALID SPI NOTIFY" message to the data originator. This notification is sent using the IKE SA. If there is no IKE SA available, the receiving peer drops the packet.

Note A single SA has only two peers. However, a SADB can have multiple SAs, whereby each SA has an association with a different peer.

When an invalid security parameter index (SPI) is encountered, the Invalid Security Parameter Index feature provides for the setting up of an IKE SA with the originator of the data, and the IKE "INVALID SPI NOTIFY" message is sent. The peer that originated the data "sees" the "INVALID SPI NOTIFY" message and deletes the IPsec SA that has the invalid SPI. If there is further traffic from the originating peer, there will not be any IPsec SAs, and new SAs will be set up. Traffic will flow again. The default behavior (that is, without configuring the Invalid Security Parameter Index Recovery feature) is that the data packet that caused the invalid SPI error is dropped. The originating peer keeps on sending the data using the IPsec SA that has the invalid SPI, and the receiving peer keeps dropping the traffic (thus creating the "black hole").

The IPsec module uses the IKE module to send an IKE "INVALID SPI NOTIFY" message to the other peer. Once the invalid SPI recovery is in place, there should not be any significant dropping of packets although the IPsec SA setup can itself result in the dropping of a few packets.

To configure your router for the Invalid Security Parameter Index Recovery feature, use the crypto isakmp invalid-spi-recovery command. The IKE SA will not be initiated unless you have configured this command.

How to Configure Invalid Security Parameter Index Recovery

This section contains the following procedure.

•Configuring Invalid Security Parameter Index Recovery

Configuring Invalid Security Parameter Index Recovery

To configure the Invalid Security Parameter Index Recovery feature, perform the following steps.

SUMMARY STEPS

1. enable

2. configure terminal

3. crypto isakmp invalid-spi-recovery

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3  

crypto isakmp invalid-spi-recovery
Example: 
Router (config)# crypto isakmp 
invalid-spi-recovery

Initiates the IKE module process whereby the IKE module notifies the receiving peer that an "Invalid SPI" error has occurred.

Verifying a Preshared Configuration

To determine the status of the IPsec SA for traffic between two peers, you can use the show crypto ipsec sa command. If the IPsec SA is available on one peer and not on the other, there is a "black hole" situation, in which case you will see the invalid SPI errors being logged for the receiving peer. If you turn console logging on or check the syslog server, you will see that these errors are also being logged.

Figure 1Figure 1 shows the topology of a typical preshared configuration setup. Host 1 is the initiating peer (initiator), and Host 2 is the receiving peer (responder).

Figure 1 Preshared Configuration Topology

SUMMARY STEPS

To verify the preshared configuration, perform the following steps.

1. Initiate the IKE and IPsec SAs between Host 1 and Host 2

2. Clear the IKE and IPsec SAs on Router B

3. Send traffic from Host 1 to Host 2 and ensure that IKE and IPsec SAs are correctly established

4. Check for an invalid SPI message on Router B

DETAILED STEPS

Step 1 Initiate the IKE and IPsec SAs between Host 1 and Host 2

Router A 

Router# show crypto isakmp sa


  f_vrf/i_vrf   dst            src             state       conn-id slot 

       / 10.2.2.2              10.1.1.1        QM_IDLE               1       0

Router B 

Router# show crypto isakmp sa


  f_vrf/i_vrf   dst            src             state       conn-id slot 

       /        10.1.1.1       10.2.2.2        QM_IDLE               1       0

Router A 

Router# show crypto ipsec sa interface fastethernet0/0


interface: FastEthernet0/0 

    Crypto map tag: testtag1, local addr. 10.1.1.1


   protected vrf: 

   local  ident (addr/mask/prot/port): (10.0.0.1/255.255.255.255/0/0) 

   remote ident (addr/mask/prot/port): (10.0.2.2/255.255.255.255/0/0) 

   current_peer: 10.2.2.2:500 

     PERMIT, flags={origin_is_acl,} 

    #pkts encaps: 10, #pkts encrypt: 10, #pkts digest: 10 

    #pkts decaps: 10, #pkts decrypt: 10, #pkts verify: 10 

    #pkts compressed: 0, #pkts decompressed: 0 

    #pkts not compressed: 0, #pkts compr. failed: 0 

    #pkts not decompressed: 0, #pkts decompress failed: 0 

    #send errors 0, #recv errors 0 


     local crypto endpt.: 10.1.1.1, remote crypto endpt.: 10.2.2.2 

     path mtu 1500, media mtu 1500 

     current outbound spi: 7AA69CB7 


     inbound esp sas: 

      spi: 0x249C5062(614223970) 

        transform: esp-des esp-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5123, flow_id: 1, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4537831/3595) 

        IV size: 8 bytes 

        replay detection support: Y 


     inbound ah sas: 

      spi: 0xB16D1587(2976716167) 

        transform: ah-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5121, flow_id: 1, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4537831/3595) 

        replay detection support: Y 


     inbound pcp sas: 


     outbound esp sas: 

      spi: 0x7AA69CB7(2057739447) 

        transform: esp-des esp-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5124, flow_id: 2, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4537835/3595) 

        IV size: 8 bytes 

        replay detection support: Y 


     outbound ah sas: 

      spi: 0x1214F0D(18960141) 

        transform: ah-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5122, flow_id: 2, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4537835/3594) 

        replay detection support: Y 


     outbound pcp sas:

Router B 

Router# show crypto ipsec sa interface Fastethernet1/0


interface: FastEthernet1/0 

    Crypto map tag: testtag1, local addr. 10.2.2.2 


   protected vrf: 

   local  ident (addr/mask/prot/port): (10.0.2.2/255.255.255.255/0/0) 

   remote ident (addr/mask/prot/port): (10.0.0.1/255.255.255.255/0/0) 

   current_peer: 10.1.1.1:500 

     PERMIT, flags={origin_is_acl,} 

    #pkts encaps: 10, #pkts encrypt: 10, #pkts digest: 10 

    #pkts decaps: 10, #pkts decrypt: 10, #pkts verify: 10 

    #pkts compressed: 0, #pkts decompressed: 0 

    #pkts not compressed: 0, #pkts compr. failed: 0 

    #pkts not decompressed: 0, #pkts decompress failed: 0 


    #send errors 0, #recv errors 0 


     local crypto endpt.: 10.2.2.2, remote crypto endpt.: 10.1.1.1 

     path mtu 1500, media mtu 1500 

     current outbound spi: 249C5062 


     inbound esp sas: 

      spi: 0x7AA69CB7(2057739447) 

        transform: esp-des esp-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5123, flow_id: 1, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4421281/3593) 

        IV size: 8 bytes 

        replay detection support: Y 


     inbound ah sas: 

      spi: 0x1214F0D(18960141) 

        transform: ah-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5121, flow_id: 1, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4421281/3593) 

        replay detection support: Y 


     inbound pcp sas: 


     outbound esp sas: 

      spi: 0x249C5062(614223970) 

        transform: esp-des esp-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5124, flow_id: 2, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4421285/3593) 

        IV size: 8 bytes 

        replay detection support: Y 


     outbound ah sas: 

      spi: 0xB16D1587(2976716167) 

        transform: ah-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5122, flow_id: 2, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4421285/3592) 

        replay detection support: Y 


     outbound pcp sas:


Step 2 Clear the IKE and IPsec SAs on Router B 

Router# clear crypto isakmp


Router# clear crypto sa


Router# show crypto isakmp sa


  f_vrf/i_vrf   dst            src             state       conn-id slot 

       /        10.2.2.2.       10.1.1.1      MM_NO_STATE           1       0 (deleted)


Router# show crypto ipsec sa


interface: FastEthernet1/0 

    Crypto map tag: testtag1, local addr. 10.2.2.2 



   protected vrf: 

   local  ident (addr/mask/prot/port): (10.0.2.2/255.255.255.255/0/0) 

   remote ident (addr/mask/prot/port): (10.0.0.1/255.255.255.255/0/0) 

   current_peer: 10.1.1.1:500 

     PERMIT, flags={origin_is_acl,} 

    #pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0 

    #pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0 

    #pkts compressed: 0, #pkts decompressed: 0 

    #pkts not compressed: 0, #pkts compr. failed: 0 

    #pkts not decompressed: 0, #pkts decompress failed: 0 

    #send errors 0, #recv errors 0 


     local crypto endpt.: 10.2.2.2, remote crypto endpt.: 10.1.1.1 

     path mtu 1500, media mtu 1500 

     current outbound spi: 0 


     inbound esp sas: 


     inbound ah sas: 


     inbound pcp sas: 


     outbound esp sas: 


     outbound ah sas: 


     outbound pcp sas:

Step 3 Send traffic from Host 1 to Host 2 and ensure that new IKE and IPsec SAs are correctly established 

ping 

Protocol [ip]: ip 

Target IP address: 10.0.2.2 

Repeat count [5]: 30 

Datagram size [100]: 100 

Timeout in seconds [2]: 

Extended commands [n]: no 

Sweep range of sizes [n]: n 

Type escape sequence to abort. 

Sending 30, 100-byte ICMP Echos to 10.0.2.2, timeout is 2 seconds: 

..!!!!!!!!!!!!!!!!!!!!!!!!!!!! 

Success rate is 93 percent (28/30), round-trip min/avg/max = 1/3/8 ms 


RouterB# show crypto isakmp sa


  f_vrf/i_vrf   dst            src             state       conn-id slot 

       /        10.1.1.1       10.2.2.2     QM_IDLE               3       0 

       /        10.1.1.1       10.2.2.2      MM_NO_STATE           1       0 (deleted) 


RouterB# show crypto ipsec sa 


interface: FastEthernet1/0 

    Crypto map tag: testtag1, local addr. 10.2.2.2 


   protected vrf: 

   local  ident (addr/mask/prot/port): (10.0.2.2/255.255.255.255/0/0) 

   remote ident (addr/mask/prot/port): (10.0.0.1/255.255.255.255/0/0) 

   current_peer: 10.1.1.1:500 

     PERMIT, flags={origin_is_acl,} 

    #pkts encaps: 28, #pkts encrypt: 28, #pkts digest: 28 

    #pkts decaps: 28, #pkts decrypt: 28, #pkts verify: 28 

    #pkts compressed: 0, #pkts decompressed: 0 

    #pkts not compressed: 0, #pkts compr. failed: 0 


    #pkts not decompressed: 0, #pkts decompress failed: 0 

    #send errors 0, #recv errors 0 


     local crypto endpt.: 10.2.2.2, remote crypto endpt.: 10.1.1.1 

     path mtu 1500, media mtu 1500 

     current outbound spi: D763771F 


     inbound esp sas: 

      spi: 0xE7AB4256(3886760534) 

        transform: esp-des esp-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5127, flow_id: 3, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4502463/3596) 

        IV size: 8 bytes 

        replay detection support: Y 


     inbound ah sas: 

      spi: 0xF9205CED(4179647725) 

        transform: ah-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5125, flow_id: 3, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4502463/3596) 

        replay detection support: Y 


     inbound pcp sas: 


     outbound esp sas: 

      spi: 0xD763771F(3613619999) 

        transform: esp-des esp-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5128, flow_id: 4, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4502468/3596) 

        IV size: 8 bytes 

        replay detection support: Y 


     outbound ah sas: 

      spi: 0xEB95406F(3952427119) 

        transform: ah-sha-hmac , 

        in use settings ={Tunnel, } 

        slot: 0, conn id: 5126, flow_id: 4, crypto map: testtag1 

        crypto engine type: Hardware 

        sa timing: remaining key lifetime (k/sec): (4502468/3595) 

        replay detection support: Y 


     outbound pcp sas: 


RouterA# show crypto isakmp sa


  f_vrf/i_vrf   dst            src             state       conn-id slot 

       /        10.2.2.2       10.1.1.1      MM_NO_STATE           1       0 (deleted) 

       /        10.2.2.2       10.1.1.1      QM_IDLE               2       0


Step 4 Check for an invalid SPI message on Router B 

Router# show logging



Syslog logging: enabled (10 messages dropped, 13 messages rate-limited, 0 flushes, 0 
overruns, xml disabled) 

    Console logging: disabled 

    Monitor logging: level debugging, 0 messages logged, xml disabled 

    Buffer logging: level debugging, 43 messages logged, xml disabled 

    Logging Exception size (8192 bytes) 

    Count and timestamp logging messages: disabled 

    Trap logging: level informational, 72 message lines logged 


Log Buffer (8000 bytes): 


*Mar 24 20:55:45.739: %CRYPTO-4-RECVD_PKT_INV_SPI: decaps: rec'd IPSEC packet has invalid 
spi for 

        destaddr=10.2.2.2, prot=51, spi=0x1214F0D(18960141), srcaddr=10.1.1.1 

*Mar 24 20:55:47.743: IPSEC(validate_proposal_request): proposal part #1, 

  (key eng. msg.) INBOUND local= 10.2.2.2, remote= 10.1.1.1, 

    local_proxy= 10.0.2.2/255.255.255.255/0/0 (type=1), 

    remote_proxy= 10.0.0.1/255.255.255.255/0/0 (type=1), 

    protocol= AH, transform= ah-sha-hmac , 

    lifedur= 0s and 0kb, 

    spi= 0x0(0), conn_id= 0, keysize= 0, flags= 0x2 

*Mar 24 20:55:47.743: IPSEC(validate_proposal_request): proposal part #2, 

  (key eng. msg.) INBOUND local= 10.2.2.2, remote= 10.1.1.1, 

    local_proxy= 10.0.2.2/255.255.255.255/0/0 (type=1), 

    remote_proxy= 10.0.0.1/255.255.255.255/0/0 (type=1), 

    protocol= ESP, transform= esp-des esp-sha-hmac , 

    lifedur= 0s and 0kb, 

    spi= 0x0(0), conn_id= 0, keysize= 0, flags= 0x2 

*Mar 24 20:55:47.743: IPSEC(kei_proxy): head = testtag1, map->ivrf = , kei->ivrf = 

*Mar 24 20:55:47.743: IPSEC(key_engine): got a queue event with 2 kei messages 

*Mar 24 20:55:47.743: IPSEC(spi_response): getting spi 4179647725 for SA 

        from 10.2.2.2        to 10.1.1.1     for prot 2 

*Mar 24 20:55:47.747: IPSEC(spi_response): getting spi 3886760534 for SA 

        from 10.2.2.2     to 10.1.1.1        for prot 3 

*Mar 24 20:55:48.071: IPSec: Flow_switching Allocated flow for flow_id 939524099 

*Mar 24 20:55:48.071: IPSec: Flow_switching Allocated flow for flow_id 939524100 

*Mar 24 20:55:48.135: IPSEC(key_engine): got a queue event with 4 kei messages 

*Mar 24 20:55:48.135: IPSEC(initialize_sas): , 

  (key eng. msg.) INBOUND local= 10.2.2.2, remote= 10.1.1.1, 

    local_proxy= 10.0.2.2/0.0.0.0/0/0 (type=1), 

    remote_proxy= 10.0.0.1/0.0.0.0/0/0 (type=1), 

    protocol= AH, transform= ah-sha-hmac , 

    lifedur= 3600s and 4608000kb, 

    spi= 0xF9205CED(4179647725), conn_id= 939529221, keysize= 0, flags= 0x2 

*Mar 24 20:55:48.135: IPSEC(initialize_sas): , 

  (key eng. msg.) OUTBOUND local= 10.2.2.2, remote= 10.1.1.1, 

    local_proxy= 10.0.2.2/0.0.0.0/0/0 (type=1), 

    remote_proxy= 10.0.0.1/0.0.0.0/0/0 (type=1), 

    protocol= AH, transform= ah-sha-hmac , 

    lifedur= 3600s and 4608000kb, 

    spi= 0xEB95406F(3952427119), conn_id= 939529222, keysize= 0, flags= 0xA 

*Mar 24 20:55:48.135: IPSEC(initialize_sas): , 

  (key eng. msg.) INBOUND local= 10.2.2.2, remote= 10.1.1.1, 

    local_proxy= 10.0.2.2/0.0.0.0/0/0 (type=1), 

    remote_proxy= 10.0.0.1/0.0.0.0/0/0 (type=1), 

    protocol= ESP, transform= esp-des esp-sha-hmac , 

    lifedur= 3600s and 4608000kb, 

    spi= 0xE7AB4256(3886760534), conn_id= 939529223, keysize= 0, flags= 0x2 

*Mar 24 20:55:48.135: IPSEC(initialize_sas): , 

  (key eng. msg.) OUTBOUND local= 10.2.2.2, remote= 10.1.1.1, 

    local_proxy= 10.0.2.2/0.0.0.0/0/0 (type=1), 

    remote_proxy= 10.0.0.1/0.0.0.0/0/0 (type=1), 

    protocol= ESP, transform= esp-des esp-sha-hmac , 


    lifedur= 3600s and 4608000kb, 

    spi= 0xD763771F(3613619999), conn_id= 939529224, keysize= 0, flags= 0xA 

*Mar 24 20:55:48.139: IPSEC(kei_proxy): head = testtag1, map->ivrf = , kei->ivrf = 

*Mar 24 20:55:48.139: IPSEC(mtree_add_ident): src 10.2.2.2, dest 10.1.1.1, dest_port 0 


*Mar 24 20:55:48.139: IPSEC(create_sa): sa created, 

  (sa) sa_dest= 10.1.1.1, sa_prot= 51, 

    sa_spi= 0xF9205CED(4179647725), 

    sa_trans= ah-sha-hmac , sa_conn_id= 939529221 

*Mar 24 20:55:48.139: IPSEC(create_sa): sa created, 

  (sa) sa_dest= 10.2.2.2, sa_prot= 51, 

    sa_spi= 0xEB95406F(3952427119), 

    sa_trans= ah-sha-hmac , sa_conn_id= 939529222 

*Mar 24 20:55:48.139: IPSEC(create_sa): sa created, 

  (sa) sa_dest= 10.1.1.1, sa_prot= 50, 

    sa_spi= 0xE7AB4256(3886760534), 

    sa_trans= esp-des esp-sha-hmac , sa_conn_id= 939529223 

*Mar 24 20:55:48.139: IPSEC(create_sa): sa created, 

  (sa) sa_dest= 10.2.2.2, sa_prot= 50, 

    sa_spi= 0xD763771F(3613619999), 

    sa_trans= esp-des esp-sha-hmac , sa_conn_id= 939529224 

ipseca-72a#

Configuration Examples for Invalid Security
Parameter Index Recovery

This section provides the following configuration example.

•Invalid Security Parameter Index Recovery: Example

Invalid Security Parameter Index Recovery: Example

The following example shows that invalid security parameter index recovery has been configured on Router A and Router B. Figure 1 shows the topology used for this example.

Router A 

Router# show running-config


Building configuration... 


Current configuration : 2048 bytes 

! 

version 2.1 

no service pad 

service timestamps debug datetime msec localtime 

service timestamps log datetime msec localtime 

no service password-encryption 

service tcp-small-servers 

! 

hostname ipseca-71a 

! 

logging queue-limit 100 

no logging console 

enable secret 5 $1$4GZB$L2YOmnenOCNAu0jgFxebT/ 

enable password lab 

! 

clock timezone PST -8 


clock summer-time PDT recurring 

ip subnet-zero 

! 

! 

no ip domain lookup 

! 

ip cef 

ip audit notify log 

ip audit po max-events 100 

mpls ldp logging neighbor-changes 

no ftp-server write-enable 

! 

! 

no voice hpi capture buffer 

no voice hpi capture destination 

! 

! 

crypto isakmp policy 1 

 authentication pre-share 

 lifetime 180 

crypto isakmp key 0 1234 address 10.2.2.2

crypto isakmp invalid-spi-recovery 

! 

! 

crypto ipsec transform-set auth2 ah-sha-hmac esp-des esp-sha-hmac 

! 

crypto map testtag1 10 ipsec-isakmp 

 set peer 10.2.2.2 

 set transform-set auth2 

 match address 150 

! 

! 

controller ISA 5/1 

! 

! 

interface FastEthernet0/0 

 ip address 10.1.1.1 255.0.0.0 

 no ip route-cache cef 

 duplex full 

 speed 100 

 crypto map testtag1 

! 

interface FastEthernet0/1 

 ip address 10.0.0.1 255.0.0.0 

 no ip route-cache cef 

 duplex auto 

 speed auto 

! 

interface Serial1/0 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 serial restart_delay 0 

 clockrate 128000 

! 

interface Serial1/1 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 serial restart_delay 0 

 clockrate 128000 

! 


interface Serial1/2 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 serial restart_delay 0 

! 

interface Serial1/3 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 no keepalive 

 serial restart_delay 0 

 clockrate 128000 

! 

ip classless 

ip route 10.3.3.3 255.0.0.0 10.2.0.1 

no ip http server 

no ip http secure-server 

! 

! 

access-list 150 permit ip host 10.0.0.1 host 10.0.2.2 

dialer-list 1 protocol ip permit 

dialer-list 1 protocol ipx permit 

! 

! 

call rsvp-sync 

! 

! 

mgcp profile default 

! 

! 

line con 0 

 exec-timeout 0 0 

line aux 0 

line vty 0 4 

 password lab 

 login 

! 

! 

end 


ipseca-71a#

Router B 

Router# show running-config


Building configuration... 


Current configuration : 2849 bytes 

! 

version 2.1 

no service pad 

service timestamps debug datetime msec localtime 

service timestamps log datetime msec localtime 

no service password-encryption 

service udp-small-servers 

service tcp-small-servers 

! 

hostname ipseca-72a 

! 


logging queue-limit 100 

no logging console 

enable secret 5 $1$kKqL$5Th5Qhw1ubDkkK90KWFxi1 

enable password lab 

! 

clock timezone PST -8 

clock summer-time PDT recurring 

ip subnet-zero 

! 

! 

no ip domain lookup 

! 

ip cef 

ip audit notify log 

ip audit po max-events 100 

mpls ldp logging neighbor-changes 

no ftp-server write-enable 

! 

! 

no voice hpi capture buffer 

no voice hpi capture destination 

! 

! 

mta receive maximum-recipients 0 

! 

! 

crypto isakmp policy 1 

 authentication pre-share 

 lifetime 180 

crypto isakmp key 0 1234 address 10.1.1.1 

crypto isakmp invalid-spi-recovery 

! 

! 

crypto ipsec transform-set auth2 ah-sha-hmac esp-des esp-sha-hmac 

! 

crypto map testtag1 10 ipsec-isakmp 

 set peer 10.1.1.1 

 set transform-set auth2 

 match address 150 

! 

! 

controller ISA 5/1 

! 

! 

interface FastEthernet0/0 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 duplex half 

! 

interface FastEthernet1/0 

 ip address 10.2.2.2 255.0.0.0 

 no ip route-cache cef 

 duplex half 

 crypto map testtag1 

! 

interface FastEthernet1/1 

 ip address 10.0.2.2 255.0.0.0 

 no ip route-cache cef 

 duplex half 

! 

interface FastEthernet1/2 

 no ip address 


 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 duplex half 

! 

interface FastEthernet1/3 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 duplex half 

! 

interface FastEthernet1/4 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 duplex half 

! 

interface FastEthernet1/5 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 duplex half 

! 

interface FastEthernet1/6 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 duplex half 

! 

interface FastEthernet1/7 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 duplex half 

! 

interface Serial3/0 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 serial restart_delay 0 

! 

interface Serial3/1 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 serial restart_delay 0 

 clockrate 128000 

! 

interface Serial3/2 

 no ip address 

 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 serial restart_delay 0 

! 

interface Serial3/3 

 no ip address 


 no ip route-cache 

 no ip mroute-cache 

 shutdown 

 no keepalive 

 serial restart_delay 0 

 clockrate 128000 

! 

ip classless 

ip route 10.0.0.0 255.0.0.0 10.2.0.1 

no ip http server 

no ip http secure-server 

!

!

access-list 150 permit ip host 10.0.2.2 host 10.0.0.1 

dialer-list 1 protocol ip permit 

dialer-list 1 protocol ipx permit 

!

!

call rsvp-sync 

!

!

mgcp profile default 

! 

dial-peer cor custom 

!

!

gatekeeper 

 shutdown 

!

!

line con 0 

 exec-timeout 0 0 

 stopbits 1 

line aux 0 

 stopbits 1 

line vty 0 4 

 password lab 

 login 

!

!

end

Additional References

The following sections provide references relate to Invalid Security Parameter Index Recovery.

Related Documents

Related Topic
Document Title

Configuring IKE

Configuring Internet Key Exchange for IPsec VPNs

Interface commands

Cisco IOS Master Command List


Standards

Standards
Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

—


MIBs

MIBs
MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs


RFCs

RFCs
Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

—


Technical Assistance

Description
Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport


Feature Information for Invalid Security Parameter
Index Recovery

Table 1 lists the release history for this feature.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS XE software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS XE software release that introduced support for a given feature in a given Cisco IOS XE software release train. Unless noted otherwise, subsequent releases of that Cisco IOS XE software release train also support that feature.

Table 1 Feature Information for Invalid Security Parameter Index Recovery 

Feature Name
Releases
Feature Information

Invalid Special Parameter Index (SPI) Recovery

Cisco IOS XE Release 2.1

When an invalid SPI occurs in IPsec packet processing, the Invalid Security Parameter Index Recovery feature allows for an IKE SA to be established. The "IKE" module sends notification of the "Invalid SPI" error to the originating IPsec peer so that Security Association Databases (SADBs) can be resynchronized and successful packet processing can be resumed.

The following command was introduced or modified: crypto isakmp invalid-spi-recovery.


CCDE, CCENT, CCSI, Cisco Eos, Cisco HealthPresence, Cisco IronPort, the Cisco logo, Cisco Lumin, Cisco Nexus, Cisco Nurse Connect, Cisco Pulse, Cisco StackPower, Cisco StadiumVision, Cisco TelePresence, Cisco Unified Computing System, Cisco WebEx, DCE, Flip Channels, Flip for Good, Flip Mino, Flipshare (Design), Flip Ultra, Flip Video, Flip Video (Design), Instant Broadband, and Welcome to the Human Network are trademarks; Changing the Way We Work, Live, Play, and Learn, Cisco Capital, Cisco Capital (Design), Cisco:Financed (Stylized), Cisco Store, and Flip Gift Card are service marks; and Access Registrar, Aironet, AllTouch, AsyncOS, Bringing the Meeting To You, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, CCVP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco  IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Collaboration Without Limitation, Continuum, EtherFast, EtherSwitch, Event Center, Explorer, Fast Step, Follow Me Browsing, FormShare, GainMaker, GigaDrive, HomeLink, iLYNX, Internet Quotient, IOS, iPhone, iQuick Study, IronPort, the IronPort logo, Laser Link, LightStream, Linksys, MediaTone, MeetingPlace, MeetingPlace Chime Sound, MGX, Networkers, Networking Academy, Network Registrar, PCNow, PIX, PowerKEY, PowerPanels, PowerTV, PowerTV (Design), PowerVu, Prisma, ProConnect, ROSA, ScriptShare, SenderBase, SMARTnet, Spectrum Expert, StackWise, The Fastest Way to Increase Your Internet Quotient, TransPath, WebEx, and the WebEx logo are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.

All other trademarks mentioned in this document or website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0908R)

Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

©2003- 2009 Cisco Systems, Inc. All rights reserved.