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bootrom update on Huawei S5300 switch

Some time ago I had a case with damaged file system on Huawei S5300 switch. It had been caused by power failure on one site. The switch was not able to decompress VRP software and rebooted itself all the time.

BIOS LOADING ...
Copyright (c) 2008-2010 HUAWEI TECH CO., LTD.
(Ver107, Jan 18 2011, 22:52:53)

Press Ctrl+B to enter BOOTROM menu... 1
Auto-booting...
Update Epld file ............................ None
Decompressing VRP software ..................

BIOS LOADING ...
Copyright (c) 2008-2010 HUAWEI TECH CO., LTD.
(Ver107, Jan 18 2011, 22:52:53)

Press Ctrl+B to enter BOOTROM menu... 1
Auto-booting...
Update Epld file ............................ None
Decompressing VRP software ..................

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how to change the size of the history command buffer

I spent last week skiing in Polish winter capital – Zakopane. You probably noticed that I didn’t post any new article but weather was wonderful and I had no motivation to turn on my notebook ;).

As plenty of things, after my vacation, keeping me busy, today a short post about command buffer size.

By default the size of the history command buffer is 10. This means that last 10 commands entered by the user can be stored on the memory and repeated using the CLI “↑” key. The range of the command buffer can be tuned and its range is 0 to 256.

How to change the size of the history command buffer?

[labnarioR1]user-interface vty 1
[labnarioR1-ui-vty1] history-command max-size 50

Now, using the CLI “↑” key, we can repeat last 50 commands entered by the user. Command can be used on Console, VTY and TTY user terminal interfaces.

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assigning multiple IP addresses to network interface

Why might we want to assign multiple IP addresses to the same interface? The following are the most common scenarios:

  • hosts in the network segment use IP addresses on different networks
  • there are not enough host addresses on a logical network segment, suppose a /24 address space and 300 hosts

How to configure multiple IP addresses on Huawei devices?

Let’s configure a pair of routers connected via a Gigabit Ethernet link and use four different logical networks. Continue reading

from Huawei command line – “check …”

Huawei NE40E-X8Very useful command, especially when you are preparing and executing upgrade of a software of Huawei carrier class devices, like NE40E and CX600. Let’s look what can be checked by this command:

<labnario>check ?
  hardware-compatibility  hardware compatibility
  startup                 Check the version of the resource file
  system-software         system-software
  version                 check version

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how to solve problem of hanging alarms in Huawei U2000

Huawei NMS U2000Let’s assume that you have U2000 NMS server to monitor Huawei devices. We can manage these devices in 2 ways: outbound or inbound management. Outbound management means that you have a separate DCN network to manage devices. It is commonly used for critical nodes, for example for backbone routers. Unlike to backbone network, it is difficult to implement DCN for mobile backhaul networks, where the number of devices reaches hundreds or even thousands. In such situation inbound management is implemented to reduce cost. Then the decision how to send SNMP packets to the NMS server is based on routing protocols. The packets travel through the monitored network and are susceptible to all turbulences, which can appear in the network. This may lead to the fact that some SNMP packets may be lost by the network.

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