When configuring the auto detect function,
go to these sections for information you are interested in:
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Introduction
to the Auto Detect Function
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Auto
Detect Configuration
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Auto
Detect Configuration Examples
The Auto Detect function uses ICMP
request/reply packets to test network connectivity regularly.
The detected object of the Auto Detect
function is a detected group, which is a set of IP addresses. To check the
reachability to a detected group, a switch enabled with Auto Detect sends ICMP
requests to the group and waits for the ICMP replies from the group based on
the user-defined policy (which includes the number of ICMP requests and the timeout
waiting for a reply). Then according to the check result, the switch determines
whether to make the applications using the detected group take effect.
Currently, the following features are used
in conjunction with Auto Detect:
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Static route
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Virtual Router Redundancy Protocol (VRRP)
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Interface backup
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A detected group can be used by multiple
applications simultaneously.
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For details about static routing, refer to the Routing
Protocol part of the manual.
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For details about VRRP, refer the VRRP part of
the manual.
Complete the following tasks to configure auto
detect:
Follow these steps
to configure the auto detect function:
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To do…
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Use the command…
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Remarks
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Enter system view
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system-view
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—
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Create a detected group and enter detected
group view
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detect-group group-number
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Required
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Add an IP address to be detected to the detected
group
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detect-list list-number ip address ip-address [ nexthop
ip-address ]
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Required
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Specify a relationship between detected
IP addresses in the group
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option [ and
| or ]
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Optional
By default, the and keyword is
specified.
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Set an interval between detecting
operations
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timer loop
interval
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Optional
By default, the detecting interval is 15
seconds.
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Set the number of ICMP requests during a
detecting operation
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retry retry-times
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Optional
By default, the number is 2.
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Set a timeout waiting for an ICMP reply
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timer wait
seconds
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Optional
By default, the timeout
is 2 seconds.
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Display the detected group configuration
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display detect-group [ group-number ]
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Available in any view
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If the relationship
between IP addresses of a detected group is and, any unreachable IP
address in the group makes the detected group unreachable and the remaining IP
addresses will not be detected. If the relationship is or, any reachable
IP address makes the detected group reachable and the remaining IP addresses
will not be detected.
You can bind a static route with a detected
group. The Auto Detect function will then detect the reachability of the static
route through the path specified in the detected group.
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The static route is valid if the detected group
is reachable.
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The static route is invalid if the detected
group is unreachable.
You need to create the
detected group before performing the following operations.
Follow these steps
to configure the auto detect function for a static route:
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To do…
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Use the command…
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Remarks
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Enter system view
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system-view
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—
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Bind a detected group to a static route
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ip route-static ip-address { mask | mask-length } { interface-type
interface-number | next-hop } [ preference preference-value
] [ reject | blackhole ] detect-group group-number
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Required
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You can enable Auto Detect on the master
switch in a VRRP group, use the Auto Detect function to detect the routes from
the master switch to other networks, and use the detection results
(reachable/unreachable) to control the priority of the master switch, so as to
realize the automatic master-backup switchover:
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The master switch keeps as Master when the detected
group is reachable.
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The priority of the master switch decreases and
thus becomes a Backup when the detected group is unreachable.
You need to create the
detected group and perform VRRP-related configurations before the following
operations.
Follow these steps
to configure the auto detect function for VRRP:
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To do…
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Use the command…
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Remarks
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Enter system view
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system-view
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—
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Enter VLAN interface view
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interface Vlan-interface vlan-id
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—
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Enable the auto detect function for VRRP
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vrrp vrid virtual-router-id track
detect-group group-number [ reduced value-reduced ]
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Required
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Using Auto Detect can help realize VLAN
interfaces backup. When data can be transmitted through two VLAN interfaces on
the switch to the same destination, configure one of the VLAN interface as the active
interface and the other as the standby interface. The standby interface is
enabled automatically when the active fails, so as to ensure the data
transmission. In this case, the Auto Detect function is implemented as follows:
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In normal situations (that is, when the detected
group is reachable), the standby VLAN interface is down and packets are
transmitted through the active VLAN interface.
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When the link between the active VLAN interface
and the destination faults (that is, the detected group is unreachable),
the system enables the backup VLAN interface.
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When the link between the active VLAN interface
and the destination recovers (that is, the detected group becomes reachable
again), the system shuts down the standby VLAN interface again.
You need to create the
detected group and perform configurations concerning VLAN interfaces before the
following operations.
Follow these steps
to configure the auto detect function for VLAN interface backup:
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To do…
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Use the command…
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Remarks
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Enter system view
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system-view
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—
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Enter VLAN interface view
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interface Vlan-interface vlan-id
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—
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Enable the
auto detect function to implement VLAN interface backup
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standby detect-group group-number
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Required
This
operation is only needed on the secondary VLAN interface.
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I. Network requirements
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Create detected group 8 on Switch A; detect the
reachability of the IP address 10.1.1.4, with 192.168.1.2 as the next hop, and
the detecting number set to 1.
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On switch A, configure a static route to Switch C.
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Enable the static route when the detected group
8 is reachable.
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To ensure normal operating of the auto detect function,
configure a static route to Switch A on Switch C.
II. Network diagram
Figure 1-1 Network diagram for
implementing the auto detect function in static route
III. Configuration procedure
Configure the IP addresses of all the
interfaces as shown in Figure
1-1. The configuration procedure is omitted.
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Configure Switch A.
# Enter system view.
<SwitchA> system-view
# Create detected group 8.
[SwitchA] detect-group 8
# Detect the reachability of 10.1.1.4/24,
with 192.168.1.2/24 as the next hop, and the detecting number set to 1.
[SwitchA-detect-group-8] detect-list
1 ip address 10.1.1.4 nexthop 192.168.1.2
[SwitchA-detect-group-8] quit
# Enable the static route when the detected
group is reachable. The static route is invalid when the detected group is
unreachable.
[SwitchA] ip route-static 10.1.1.4 24
192.168.1.2 detect-group 8
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Configure Switch C.
# Enter system view.
<SwitchC> system-view
# Configure a static route to Switch A.
[SwitchC] ip route-static 192.168.1.1
24 10.1.1.3
I. Network requirements
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Switch A and switch B form VRRP group 1, whose
virtual IP address is 192.168.1.10.
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Packets sourced from Host A and destined for Host
B is forwarded by Switch A under normal situations.
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When the connection between Switch A and Switch
C fails, Switch B becomes the master in VRRP group 1 automatically and the link
from Switch B to Host B, the backup link, is enabled.
II. Network diagram
Figure 1-2 Network diagram for
implementing the auto detect function in VRRP
III. Configuration procedure
Configure the IP addresses of all the
interfaces as shown in Figure
1-2. The configuration procedure is omitted.
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Configure Switch A.
# Create detected group 9.
<SwitchA> system-view
[SwitchA] detect-group 9
# Specify to detect the reachability of the
IP address 10.1.1.4/24, setting the detect number to 1.
[SwitchA-detect-group-9] detect-list
1 ip address 10.1.1.4
[SwitchA-detect-group-9] quit
# Enable VRRP on VLAN-interface 1 and
assign a virtual IP address to the VRRP group.
[SwitchA] interface vlan-interface 1
[SwitchA-Vlan-interface1] vrrp vrid 1
virtual-ip 192.168.1.10
# Set the VRRP group priority of switch A to
110, and specify to decrease the priority by 20 when the result of detected
group 9 is unreachable.
[SwitchA-Vlan-interface1] vrrp vrid 1
priority 110
[SwitchA-Vlan-interface1] vrrp vrid 1
track detect-group 9 reduced 20
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Configure Switch B.
# Enable VRRP on VLAN-interface 1 and
assign a virtual IP address to the VRRP group.
<SwitchB> system-view
[SwitchB] interface vlan-interface 1
[SwitchB-Vlan-interface1] vrrp vrid 1
virtual-ip 192.168.1.10
# Set the VRRP group priority of Switch B to
100.
[SwitchB-Vlan-interface1] vrrp vrid 1
priority 100
I. Network requirements
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Make sure the routes between Switch A, Switch B,
and Switch C, and between Switch A, Switch D, and Switch C are reachable.
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Create detected group 10 on Switch A to detect
the connectivity between Switch B and Switch C.
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Configure VLAN-interface 1 to be the active interface,
which is enabled when the detected group 10 is reachable.
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Configure VLAN-interface 2 to be the standby interface,
which is enabled when the detected group 10 is unreachable.
II. Network diagram
Figure 1-3 Network diagram for VLAN interface backup
III. Configuration procedure
Configure the IP addresses of all the interfaces
as shown in Figure 1-3.
The configuration procedure is omitted.
# Enter system view.
<SwitchA> system-view
# Create auto detected group 10.
[SwitchA] detect-group 10
# Add the IP address of 10.1.1.4 to detected
group 10 to detect the reachability of the IP address, with the IP address of
192.168.1.2 as the next hop, and the detecting number set to 1.
[SwitchA-detect-group-10] detect-list
1 ip address 10.1.1.4 nexthop 192.168.1.2
[SwitchA-detect-group-10] quit
# Specify to enable VLAN-interface 2 when
the result of detected group 10 is unreachable.
[SwitchA] interface vlan-interface 2
[SwitchA-Vlan-interface2] standby
detect-group 10
