Tag Archives: Huawei S5700

Network administrators often need to capture packets, on switches or routers, to locate faults. Some devices do not support remote mirroring, that’s why administrators have to go on-site to capture packets, using local mirroring.

We have a useful command (capture-packet …), on some devices, to catch packets remotely. When taking S5700 switch into consideration, we can capture all packets from an interface (port mirroring) or packets matching specified rules (traffic mirroring). These capture packets can be sent to FTP or TFTP servers and displayed on terminal screen. CX600 and NE40E routers with V6R3 software version can send capture packets to local CF card (name.cap file).

Let’s look at this command:

[Huawei]capture-packet ?
  acl        Acl
  cpu        Packet send to cpu
  interface  Ingress Interface

As you can see you can use port or traffic mirroring. You can also catch packets sent to CPU.

[Huawei]capture-packet interface GigabitEthernet 0/0/1 destination ?
  ftp-server   Send to ftp server
  terminal     Output terminal
  tftp-server  Send to tftp server

What we want to do is to configure 802.1q trunk between labnario1 router and labnarioSW1 switch, so that hosts from VLAN 100 will be able to ping the router’s interface.

Let’s look at the simple topology:

First we want to configure labnario1 router. To configure Ge0/0/1 interface to operate as a 802.1q trunk, we need to configure it as follows:

<labnario1>system-view
[labnario1]
[labnario1]interface GigabitEthernet 0/0/1
[labnario1-GigabitEthernet0/0/1]portswitch
[labnario1-GigabitEthernet0/0/1]port link-type trunk

Link aggregation, in other words trunking, is a technique that helps to increase bandwidth by bundling multiple physical interfaces into a logical one, named Eth-trunk. Besides bandwidth increase, trunking lets us to implement load-balancing and ensure higher reliability.

Few restrictions must be taken into consideration when creating Eth-trunk interface:

• parameters of physical interfaces (number, transmission rate, duplex mode and traffic-control mode) on both ends of the trunk link must be consistent.
• data sequence must be unchanged (frames belonging to the same data flow are transmitted over the same physical link).

Eth-Trunk interfaces configured on S5700 switch support the following features:

• Layer 2 forwarding and Layer 3 forwarding (unicast and multicast).
• Hash algorithm-based load balancing.
• QoS on the trunk interface.

There are 2 methods of link aggregation:

• manual load balancing mode