Political process of selection ISAKMP

Hi all

I have a question about how political ISAKMP is chosen in a router. Router 1 and 3 are connected via IPSec VPN. Here are their ISAKMP policies:

R1 #sh run | s policy
crypto ISAKMP policy 10
BA aes 256
preshared authentication
Group 2
crypto ISAKMP policy 20
BA 3des
preshared authentication
Group 2

==========================

R3 #sh run | s policy
crypto ISAKMP policy 1
BA 3des
preshared authentication
crypto ISAKMP policy 10
BA 3des
preshared authentication
Group 2
crypto ISAKMP policy 20
BA 3des
preshared authentication
Group 2
crypto ISAKMP policy 30
BA 3des
preshared authentication
Group 2
crypto ISAKMP policy 40
BA aes 256
preshared authentication
Group 2
life 1800
crypto ISAKMP policy 50
BA aes 256
preshared authentication
Group 2

I have no problem with the phase 2. However, on the phase 1 AES/SHA is chosen - but with the life of 1800.

R3 #sh crypto isa in detail its
Code: C - IKE configuration mode, D - Dead Peer Detection
NAT-traversal - KeepAlive, N - K
T - cTCP encapsulation, X - IKE Extended Authentication
PSK - GIPR pre-shared key - RSA signature
renc - RSA encryption
IPv4 Crypto ISAKMP Security Association

C - id Local Remote I have VRF status BA hash Auth DH lifetime limit.

1001 23.0.0.3 12.0.0.1 aes ACTIVE sha psk 2 00:29:54
Engine-id: Conn-id = SW:1

IPv6 Crypto ISAKMP Security Association

Beyond output is taken as soon as the tunnel is built - and that's how I know that policy with the life expectancy of 1800 is chosen. There are times when 3des is selected as well:

R3 #sh in detail its crypto isakmp
Code: C - IKE configuration mode, D - Dead Peer Detection
NAT-traversal - KeepAlive, N - K
T - cTCP encapsulation, X - IKE Extended Authentication
PSK - GIPR pre-shared key - RSA signature
renc - RSA encryption
IPv4 Crypto ISAKMP Security Association

C - id Local Remote I have VRF status BA hash Auth DH lifetime limit.

1001 23.0.0.3 12.0.0.1 ACTIVE 3des sha psk 2 23:57:21
Engine-id: Conn-id = SW:1

IPv6 Crypto ISAKMP Security Association

I want to use AES - 256 with SHA value and default lifetime, which is the policy of leading in R1. Is that what I missed in the config to make the selection of the more deterministic strategy? Thank you.

Haris

Hi Haris,

The behavior is correct. If R1 initiates the connection, it sends the first isakmp policy i.e. AES/SHA/Grp-2/Pre-share/service life and once it reaches R3, R3 will analyse the policies configured for her and will scan from 10 to 50. It will get a game on 40. If AES with SHA is selected.

When R3 is initiator, 3DES/SHA/Grp2/Pre-share/life expectancy will be the first condition in the list (as it is the first in the list with 10; political policy 1 is incomplete). When the same will be analyzed on R1 for the game, it will get political game 20.

Now, you want AES/SHA/group2/Pre-share to be selected each time, then on R3, create a strategy with the lowest number.

For ex.

crypto ISAKMP policy 1
BA aes 256
preshared authentication
Group 2
life 1800
sha hash

When you apply this command, it will remove the isakmp policy 1 but it won't make any difference because that isakmp policy 1 is incomplete. Please try this and tell me if this solves your problem.

Thank you

Vishnu

Tags: Cisco Security

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