Using Ping to Monitor the Reachability of Layer 3 Eth-Trunk Member Interfaces
Context
Multiple physical interfaces can bundle into an Eth-Trunk, and these physical interfaces are Eth-Trunk member interfaces. Each member interface uses a specified transmission path. The path-specific service parameters, such as delay, jitter, and packet loss ratio, are also different. Therefore, you cannot determine which member interface is faulty when the quality of services on an Eth-Trunk deteriorates. To resolve this problem, perform a ping test to detect each physical link, facilitating faulty link locating.
The ping test applies to scenarios where two devices are directly connected through an Eth-Trunk.
Pre-configuration Tasks
Before using ping to monitor the reachability of Layer 3 Eth-Trunk member interfaces, complete the following task:
- Run the undo portswitch command to configure the Eth-Trunk to work in Layer 3 mode and configure an IP address for the Layer 3 Eth-Trunk.
An Eth-Trunk works in Layer 2 mode by default.
Procedure
- Enable the receive end to monitor Layer 3 Eth-Trunk member interfaces.
- Run the trunk member-port-inspect command to enable the receive end to monitor Layer 3 Eth-Trunk member interfaces.
By default, the receive end is disabled from monitoring Layer 3 Eth-Trunk member interfaces.
The trunk member-port-inspect command takes effect for all Layer 3 Eth-Trunks on a device. To test the connectivity of Eth-Trunks, disable this function after detection of Eth-Trunk member interfaces is completed. If this function is not disabled, the device keeps monitoring Eth-Trunk member interfaces, which consumes a lot of system resources.
- Run the trunk member-port-inspect command to enable the receive end to monitor Layer 3 Eth-Trunk member interfaces.
- Enable the transmit end to monitor Layer 3 Eth-Trunk member interfaces.
- Run the ping [ ip ] [ -8021p 8021p-value | -a source-ip-address | -c count | -d | { -f | ignore-mtu } | -h ttl-value | -i interface-type interface-number | -m time | -p pattern | -q | -r | -ri | -s packetsize | -system-time | -t timeout | { -tos tos-value | -dscp dscp-value } | -v | -vpn-instance vpn-instance-name ] * host [ ip-forwarding ] command to enable the transmit end to monitor the reachability of Layer 3 Eth-Trunk member interfaces.
When testing the reachability of Layer 3 Eth-Trunk member interfaces, you must specify the -a and -i parameters in the ping command. -a and -i indicate the source IP address and source interface of ICMP Echo Request packets respectively.
The ping command output contains the following information:
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Response to each ping message: If an Echo Response packet is not received by the transmit end after the timer expires, the "Request time out" message is displayed, indicating that an Eth-Trunk member interface fails. If an Echo Response packet is received, the data bytes, message sequence number, and response time are displayed, indicating that no Eth-Trunk member interface fails.
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Final statistics: The statistics include the number of sent and received packets, percentage of failure response packets, and minimum, maximum, and average response time.
<HUAWEI> ping -a 192.168.1.1 -i 10ge 1/0/1 10.1.1.2 PING 10.1.1.2: 56 data bytes, press CTRL_C to break Reply from 10.1.1.2: bytes=56 Sequence=1 ttl=254 time=2 ms Reply from 10.1.1.2: bytes=56 Sequence=2 ttl=254 time=1 ms Reply from 10.1.1.2: bytes=56 Sequence=3 ttl=254 time=2 ms Reply from 10.1.1.2: bytes=56 Sequence=4 ttl=254 time=1 ms Reply from 10.1.1.2: bytes=56 Sequence=5 ttl=254 time=2 ms --- 10.1.1.2 ping statistics --- 5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 1/1/2 ms
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- Run the ping [ ip ] [ -8021p 8021p-value | -a source-ip-address | -c count | -d | { -f | ignore-mtu } | -h ttl-value | -i interface-type interface-number | -m time | -p pattern | -q | -r | -ri | -s packetsize | -system-time | -t timeout | { -tos tos-value | -dscp dscp-value } | -v | -vpn-instance vpn-instance-name ] * host [ ip-forwarding ] command to enable the transmit end to monitor the reachability of Layer 3 Eth-Trunk member interfaces.