H3C S9500 Series Manuale utente

Operation Manual – HVRP

H3C S9500 Series Routing Switches Table of Contents

Table of Contents

Chapter 1 HVRP Configuration....................................................................................................1-1

1.1 Introduction to HVRP.........................................................................................................1-1

1.1.1 Background.............................................................................................................1-1

1.1.2 Basic Concepts of HVRP........................................................................................1-1

1.1.3 Operating Mechanism of HVRP..............................................................................1-2

1.1.4 Network Topologies Supported by HVRP...............................................................1-4

1.2 HVRP Configuration Task..................................................................................................1-5

1.2.1 Configuring HVRP...................................................................................................1-6

1.2.2 Configuring HVRP Time Parameters and Attributes...............................................1-7

1.2.3 Configuring VLAN Attributes of HVRP....................................................................1-8

1.3 Displaying and Maintaining HVRP Configuration..............................................................1-9

1.4 HVRP Configuration Example ...........................................................................................1-9

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Chapter 1 HVRP Configuration

When configuring HVRP, go to these sections for information you are interested in:

zIntroduction to HVRP

zConfiguring HVRP

zDisplaying and Maintaining HVRP Configuration

zHVRP Configuration Example

1.1 Introduction to HVRP

1.1.1 Background

Currently, metropolitan area networks (MANs) established by carriers usually adopt a

ring topology or a tree topology. Whichever topology is in use, it is always necessary

that devices on the distribution layer support the learning of a large number of MAC

addresses in order to satisfy the network access needs of all connected users. With the

continuous increase of network users, the current number of MAC addresses that a

switch can learn may no longer meet the actual demands. This means that MAC

addresses of some users cannot be learnt by the switch, resulting in packets being

broadcast within the VLAN, taking up extra bandwidth and undermining network

functionality.

To address the issue, the Hierarchy VLAN Register Protocol (HVRP) was introduced.

HVRP enables dynamic registration and aging of VLANs for a given port in certain

networking environments by differentiating user VLANs (local VLANs) from non-user

VLANs. It thus saves the amount of space needed for storing MAC addresses,

increasing the user capacity of the whole device.

1.1.2 Basic Concepts of HVRP

I. HVRP

In certain network environments, HVRP can be used to save MAC address storage

space for switches, and therefore, improve network scalability.

II. HVRP ports

Ports with HVRP configured, that is, ports that can send and receive HVRP packets.

III. Root HVRP port

A port with HVRP configured, also configured as a root port on a spanning tree.

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IV. Designated HVRP ports

Aport with HVRP configured, also configured as a designated port on a spanning tree.

V. Local VLANs

Local VLANs are the VLANs to which the ports with HVRP disabled belong.

VI. Registration of VLAN

Add VLANs that meet certain criteria to the list of VLANs interconnecting a given HVRP

port.

VII. Aging of VLAN

Delete a specified VLAN from the list of VLANs interconnecting a given HVRP port.

VIII. Permanent VLAN

Permanent VLANs are VLANs that will never be aged out by HVRP-enabled ports after

being created.

IX. Sending local VLAN

An HVRP packet contains the local VLAN information. With STP enabled, the

HVRP-enabled root port is responsible for sending HVRP packets.

X. VLAN registration timer

VLAN registration timer determines the interval for a root port to send HVRP registered

VLAN packets.

XI. VLAN registration ageing timer

If a port does not receive a specific HVRP VLAN registration packet within the

registered-VLAN aging time, the corresponding VLAN will be aged out.

1.1.3 Operating Mechanism of HVRP

By means of dynamic VLAN registration and aging, HVRP ages VLANs that no longer

participate in packet forwarding and only keeps those needed. When there are no more

than two ports left in a VLAN, no MAC address will be learnt and data packets will be

broadcast within the VLAN, which does not affect the network bandwidth.

Figure 1-1 shows an illustrative example of HVRP mechanism.

zEnable STP throughout the network.

zConnect the switches through trunk ports with HVRP enabled. They carry the

same set of VLANs, VLAN 201 through VLAN 600 in this example.

zDisable HVRP on the ports that do not belong to an STP ring.

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Figure 1-1 Illustrate HVRP

1) VLAN Registration

zEach device sends out its local VLAN information periodically through the HVRP

root port.

zEach device forwards the received local VLAN information through its root port,

and in the meantime registers the local VLAN information received through the

designated port on the receiving port.

zThe root bridge only registers received local VLANs with the ports that have

received HVRP packets.

zVLAN registration can be carried out only on HVRP designated ports.

zOnly VLANs that have been statically configured on a given port can be registered

with that port. For example, VLAN 999 cannot be registered with a port that does

not belong to it even if the port has received the local VLAN information that

contains VLAN 999.

zRegistration of a VLAN can affect its aging.

2) Aging of VLAN

If the HVRP designated port does not receive any VLAN registration information within

the VLAN aging time, the corresponding VLANs on the port will be aged out.

3) Sending and maintenance of local VLAN information

When a local VLAN change takes place (for instance, invalidation of a local VLAN due

to configuration change), the switch sends the local VLAN information immediately

through the HVRP root port.

In addition, the HVRP root port sends local VLAN registration packets periodically.

4) Actions taken when an HVRP-enabled port goes up or down

When an HVRP-enabled port is brought up or shut down, packets may be forwarded

improperly in the network because some VLANs are aged. Therefore, upon detecting

Operation Manual – HVRP

H3C S9500 Series Routing Switches Chapter 1 HVRP Configuration

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HVRP-enabled port state changes (port up or down events), the system sends restore

packets to have all the switches in the network reregister the aged VLANs on their

previous ports.

5) Actions upon STP port role change

When the STP role of an HVRP port has changed, the aged VLANs for this given port

should be immediately reregistered with this port.

6) Counting of ports within a given VLAN

zThe number of ports for a given VLAN should be updated whenever the following

events occurred: a new port is added to the VLAN, a port has left the VLAN, a

VLAN is registered, and the VLAN has aged.

zAn aggregation port is treated as a single port.

7) MAC address learning in a given VLAN

zLearn MAC addresses when more than two non-aged ports are present in the

VLAN.

zPause MAC address learning and remove dynamic MAC address entries that

have been learnt when only two or less than two non-aged ports are present in the

VLAN.

1.1.4 Network Topologies Supported by HVRP

I. Single Ring Networks

Figure 1-2 An HVRP-supported single ring network

Features of single ring networks:

zSTP is enabled network wide.

zSwitch 1, Switch 2, Switch 3, Switch 4, and Switch 5 are all Layer 2 switches.

Switch 1 is the root bridge and the rest connect to layer 3 devices via Switch 1.

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zThe link between Switch 3 and Switch 4 is blocked by STP.

zThe clients illustrated in Figure 1-2 include all clients connected with the device,

including terminal clients and DSLAM clients.

zIn practice, Switch 1 can be either a Layer 2 or a Layer 3 device.

II. Multi-Ring Networks

Figure 1-3 An HVRP-supported multi-ring network

Features of multi-ring networks:

zMSTP is enabled network wide, with each ring corresponding to an MSTP

instance. All the devices belong to the same domain.

zSwitch 1-2, Switch 1-3, Switch 1-4, Switch 1-5, Switch N-2, Switch N-3, Switch

N-4, and Switch N-5 are all Layer 2 switches. Switch 1 is the root bridge of all

instances and the other devices connect to Layer 3 devices via Switch 1 (Switch 1

can be either a Layer 2 or a Layer 3 device).

1.2 HVRP Configuration Task

Complete the following tasks to configure HVRP:

zConfiguring HVRP

zConfiguring HVRP Time Parameters and Attributes

zConfiguring VLAN Attributes of HVRP

Operation Manual – HVRP

H3C S9500 Series Routing Switches Chapter 1 HVRP Configuration

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1.2.1 Configuring HVRP

HVRP can be enabled in system view or in Ethernet port view. When HVRP is disabled

globally in system view or disabled in Ethernet port view, all the other HVRP-dependent

configurations will be disabled as a result.

I. Configuration Prerequisites

zHVRP-enabled ports must be Trunk ports.

zSTP is enabled globally.

zGVRP is disabled globally.

II. Configuring HVRP

Follow these steps to configure HVRP in system view:

To do … Use the command … Remarks

Enter system view system-view —

Enable HVRP hvrp enable Required

By default, HVRP is

disabled globally.

Follow these steps to configure HVRP in port view:

To do … Use the command … Remarks

Enter system view system-view —

Enter Ethernet port view interface interface-type

interface-num —

Enable HVRP hvrp enable Required

By default, HVRP is

disabled.

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Caution:

zHVRP enabled ports must be Trunk ports.

zBefore enabling HVRP on a port, it is recommended to remove VLAN 1 from the

port.

zYou can enable HVRP for an Ethernet port only after enabling HVRP globally.

zDisabling HVRP globally will disable HVRP for all ports.

zAfter you enable HVRP, do not use the mac-address max-count command on a

VLAN.

zHVRP configuration cannot be copied between ports.

zHVRP and GVRP are mutually exclusive.

zXP4 boards (except XP4L boards) do not support HVRP.

1.2.2 Configuring HVRP Time Parameters and Attributes

The parameter and attribute configuration tasks include:

zConfiguring the VLAN registration timer

zConfiguring the registered-VLAN aging interval

I. Configuration Prerequisites

The following conditions must be met:

zHVRP is enabled globally.

zHVRP is enabled on a specified port.

II. Configuring Time Parameters and Attributes

Follow these steps to configure time parameters and attributes:

To do … Use the command … Remarks

Enter system view system-view —

Configure the VLAN

registration timer hvrp timer registervlan

timer-num Optional

It is 5 seconds by default.

Configure the

registered-VLAN aging

interval

hvrp timer

registervlan-age

timer-num

Optional

It is 15 seconds by

default.

Operation Manual – HVRP

H3C S9500 Series Routing Switches Chapter 1 HVRP Configuration

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Caution:

zThe VLAN registration timer must be smaller than the registered-VLAN aging

interval. It is recommended that the latter be at least three times the former.

zOn a ring topology, all devices must have the same VLAN registration timer.

1.2.3 Configuring VLAN Attributes of HVRP

The VLAN attribute configuration tasks for HVRP include:

zConfiguring a permanent VLAN

zConfiguring the system to age all the VLANs

VLANs on a HVRP-enabled designated port can be aged out, while permanent VLANs

will never be aged out. Make sure all the specified VLANs are created before

performing the configurations below.

I. Configuring a permanent VLAN

The VLAN(s) on an HVRPport may be aged out while a permanent VLAN will never be

aged out.

You cannot configure a VLAN as a permanent VLAN unless the VLAN has been

created.

Follow these steps to configure a permanent VLAN:

To do… Use the command … Remarks

Enter system view system-view —

Configure permanent

VLANs hvrp permanent-vlan

vlan-id [to vlan-id ]

Optional

By default, no permanent

VLAN exists.

Caution:

You are recommended to configure a VLAN with an IP address as a permanent VLAN.

II. Configuring the system to age all the VLANs

In a single-ring network or multi-ring network, you can configure the system to age all

VLANs or only local VLANs. The default configuration is recommended. You can use

the hvrp vlan-age all command to configure the system to age all the VLANs.

Operation Manual – HVRP

H3C S9500 Series Routing Switches Chapter 1 HVRP Configuration

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Aswitch located on the intersection point of the intersected rings must be configured to

age all the VLANs.

Follow these steps to configure the system to age all the VLANs:

To do … Use the command … Remarks

Enter system view system-view —

Configure the system to age all

the VLANs hvrp vlan-age all Optional

1.3 Displaying and Maintaining HVRP Configuration

To do … Use the command … Remarks

Display brief HVRP information display hvrp brief Available in any view

Display detailed information on

HVRP display hvrp verbose Available in any view

Display local VLAN information display hvrp local-vlan Available in any view

Display information on VLANs

that are actually allowed to

pass through the ports display hvrp port-vlan Available in any view

Enable HVRP error debugging debugging hvrp error Available in user view

Enable VLAN debugging of

HVRP debugging hvrp info Available in user view

1.4 HVRP Configuration Example

I. Network requirements

zThe topology is a single ring network.

zSTP is enabled network wide, with Switch 1 as the root bridge.

zSwitch 1, Switch 2, Switch 3, Switch 4, and Switch 5 are all Layer 2 switches.

Switch 1 is the root bridge and the rest switches connect with Layer 3 devices via

Switch 1.

zThe link between Switch 3 and Switch 4 is blocked by STP.

zUser 1 and user 4 are household users who only want to visit the Internet through

Switch 1; user 2 and user 3 are enterprise users, and therefore in addition to

visiting the Internet, they also want to visit each other.

zUsers refer to all users connected with the switches, including terminal users and

DSLAM users.

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