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The IPsec and Quality of Service feature allows Cisco IOS quality of service (QoS) policies to be applied to IP Security (IPsec) packet flows on the basis of a QoS group that can be added to the current Internet Security Association and Key Management Protocol (ISAKMP) profile.
 Note |
Security threats, as well as the cryptographic technologies to help protect against them, are constantly changing. For more information about the latest Cisco cryptographic recommendations, see the Next Generation Encryption (NGE) white paper. |
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp . You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
You should be familiar with IPsec and the concept of ISAKMP profiles.
You should be familiar with Cisco IOS QoS.
This feature can be applied only via the ISAKMP profile. The limit of 128 QoS groups that exists for QoS applications applies to this feature as well.
You can apply an IPsec QoS group only to outbound service policies.
QoS is not supported for software encryption.
A same service policy is supported on either the main interface or its logical sub interface at a time and not on both the interfaces simultaneously.
The IPsec and Quality of Service feature allows you to apply QoS policies, such as traffic policing and shaping, to IPsec-protected packets by adding a QoS group to ISAKMP profiles. After the QoS group has been added, this group value will be mapped to the same QoS group as defined in QoS class maps. Any current QoS method that makes use of this QoS group tag can be applied to IPsec packet flows. Common groupings of packet flows can have specific policy classes applied by having the IPsec QoS group made available to the QoS mechanism. Marking IPsec flows allows QoS mechanisms to be applied to classes of traffic that could provide support for such things as restricting the amount of bandwidth that is available to specific groups or devices or marking the type of service (ToS) bits on certain flows.
The application of the QoS group is applied at the ISAKMP profile level because it is the profile that can uniquely identify devices through its concept of match identity criteria. These criteria are on the basis of the Internet Key Exchange (IKE) identity that is presented by incoming IKE connections and includes such things as IP address, fully qualified domain name (FQDN), and group (that is, the virtual private network [VPN] remote client grouping). The granularity of the match identity criteria will impose the granularity of the specified QoS policy, for example, to mark all traffic belonging to the VPN client group named “Engineering” as “TOS 5”. Another example of having the granularity of a specified QoS policy imposed would be to allocate 30 percent of the bandwidth on an outbound WAN link to a specific group of remote VPN devices.
To apply QoS policies to an ISAKMP profile, perform the following steps.
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode.
|
|
Step 2 |
configure terminal Example: |
Enters global configuration mode. |
|
Step 3 |
crypto isakmp-profile profile-number Example: |
Defines an ISAKMP profile, audits IPsec user sessions, and enters ISAKMP profile configuration mode. |
|
Step 4 |
qos-group group-number Example: |
Applies a QoS group value to an ISAKMP profile. |
To verify your IPsec and QoS sessions, perform the following steps. The show commands can be used in any order or independent of each other.
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode.
|
|
Step 2 |
show crypto isakmp profile Example: |
Shows that the QoS group is applied to the profile. |
|
Step 3 |
show crypto ipsec sa Example: |
Shows that the QoS group is applied to a particular pair of IPsec security associations (SAs). |
If you have a problem with your IPsec and QoS sessions, ensure that you have done the following:
Validated the application of QoS by the QoS service using the QoS-specific commands in the Cisco IOS Quality of Service Solutions Command Reference.
Configured a QoS policy on the router that matches the same QoS group as that specified for the class map match criterion.
Applied the service policy to the same interface to which a crypto map is applied.
In the following example, a specific QoS policy is applied to two groups of remote users. Two ISAKMP profiles are configured so that upon initial connection via IKE, remote users are mapped to a specific profile. From that profile, all IPsec SAs that have been created for that remote will be marked with the specific QoS group. As traffic leaves the outbound interface, the QoS service will map the IPsec set QoS group with the QoS group that is specified in the class maps that comprise the service policy that is applied on that outbound interface.
version 12.3
!
aaa authentication login group group radius
aaa authorization network autho local
aaa accounting update periodic 1
aaa session-id common
ip subnet-zero
!
!
ip cef
no ip domain lookup
!
class-map match-all yellow
match qos-group 3
class-map match-all blue
match qos-group 2
!
!
policy-map clients
class blue
set precedence 5
class yellow
set precedence 7
!
!
crypto isakmp policy 1
encr aes
hash sha
authentication pre-share
group 14
lifetime 300
!
crypto isakmp keepalive 10 periodic
crypto isakmp xauth timeout 20
!
crypto isakmp client configuration group blue
key cisco
dns 10.2.2.2 10.2.2.3
wins 10.6.6.6
pool blue
save-password
include-local-lan
backup-gateway corky1.cisco.com
!
crypto isakmp client configuration group yellow
dns 10.2.2.2 10.2.2.3
wins 10.6.6.5
pool yellow
!
crypto isakmp profile blue
match identity group cisco
client authentication list autho
isakmp authorization list autho
client configuration address respond
qos-group 2
crypto isakmp profile yellow
match identity group yellow
match identity address 10.0.0.11 255.255.255.255
client authentication list autho
isakmp authorization list autho
client configuration address respond
qos-group 3
!
!
crypto ipsec transform-set combo ah-sha-hmac esp-aes esp-sha-hmac
crypto ipsec transform-set client esp-aes esp-sha-hmac comp-lzs
!
crypto dynamic-map mode 1
set security-association lifetime seconds 180
set transform-set client
set isakmp-profile blue
reverse-route
crypto dynamic-map mode 2
set transform-set combo
set isakmp-profile yellow
reverse-route
!
crypto map mode 1 ipsec-isakmp dynamic mode
!
interface FastEthernet0/0
ip address 10.0.0.110 255.255.255.0
no ip redirects
no ip proxy-arp
no ip mroute-cache
duplex half
no cdp enable
crypto map mode
service-policy out clients
!
ip local pool yellow 192.168.2.1 192.168.2.10
ip local pool blue 192.168.6.1 192.168.6.6
no ip classless
!
radius-server host 10.0.0.13 auth-port 1645 acct-port 1646
radius-server key XXXXXX
radius-server vsa send accounting
radius-server vsa send authenticationThe following output shows that QoS group “2” has been applied to the ISAKMP profile “blue” and that QoS group “3” has been applied to the ISAKMP profile “yellow”:
Router# show crypto isakmp profile
ISAKMP PROFILE blue
Identities matched are:
group blue
QoS Group 2 is applied
ISAKMP PROFILE yellow
Identities matched are:
ip-address 10.0.0.13 255.255.255.255
group yellow
QoS Group 3 is appliedThe following output shows that the QoS group has been applied to a particular pair of IPsec SAs:
Router# show crypto ipsec sa
interface: FastEthernet0/0
Crypto map tag: mode, local addr. 10.0.0.110
protected vrf:
local ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0)
remote ident (addr/mask/prot/port): (10.12.12.0/255.255.255.0/0/0)
current_peer: 10.0.0.11:500
PERMIT, flags={}
#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
qos group is set to 2The following sections provide references related to the IPsec and Quality of Service feature.
|
Related Topic |
Document Title |
|---|---|
|
IPsec |
Configuring Security for VPNs with IPsec |
|
QoS options |
Cisco IOS Quality of Service Solutions Configuration Guide on Cisco.com |
|
QoS commands |
Cisco IOS Quality of Service Solutions Command Reference |
|
Security commands |
Cisco IOS Security Command Reference |
|
Recommended cryptographic algorithms |
|
Standards |
Title |
|---|---|
|
No new or modified standards are supported by this feature. |
-- |
|
MIBs |
MIBs Link |
|---|---|
|
No new or modified MIBs are supported by this feature. |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
|
RFCs |
Title |
|---|---|
|
No new or modified RFCs are supported by this feature. |
-- |
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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. |
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
IPsec and Quality of Service |
Cisco IOS XE Release 3.9S |
The IPsec and Quality of Service feature allows Cisco IOS quality of service (QoS) policies to be applied to IP Security (IPsec) packet flows on the basis of a QoS group that can be added to the current Internet Security Association and Key Management Protocol (ISAKMP) profile. The following commands were introduced or modified: qos-group. |
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