2. H3C
  3. S7500 Series
S7500 Series

H3C S7500 Series Operating instructions

  • Hello! I am an AI chatbot trained to assist you with the H3C S7500 Series Operating instructions. I’ve already reviewed the document and can help you find the information you need or explain it in simple terms. Just ask your questions, and providing more details will help me assist you more effectively!
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Table of Contents
i
Table of Contents
Chapter 1 Link Aggregation Configuration ................................................................................1-1
1.1 Overview............................................................................................................................1-1
1.1.1 Introduction to Link Aggregation .............................................................................1-1
1.1.2 Introduction to LACP...............................................................................................1-2
1.1.3 Operation Key .........................................................................................................1-2
1.1.4 Manual Aggregation Group.....................................................................................1-2
1.1.5 Static LACP Aggregation Group.............................................................................1-3
1.1.6 Dynamic LACP Aggregation Group........................................................................ 1-4
1.1.7 Restriction of LPU types on Link Aggregation ........................................................ 1-5
1.1.8 Aggregation Group Categories ...............................................................................1-7
1.2 Link Aggregation Configuration .........................................................................................1-8
1.2.1 Configuring a Manual Aggregation Group ..............................................................1-8
1.2.2 Configuring a Static LACP Aggregation Group.......................................................1-9
1.2.3 Configuring a Dynamic LACP Aggregation Group................................................1-10
1.3 Displaying and Maintaining Link Aggregation Configuration........................................... 1-11
1.4 Link Aggregation Configuration Example........................................................................1-12
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-1
Chapter 1 Link Aggregation Configuration
When configuring link aggregation, go to these sections for information you are
interested in:
z Overview
z Link Aggregation Configuration
z Displaying and Maintaining Link Aggregation Configuration
z Link Aggregation Configuration Example
1.1 Overview
1.1.1 Introduction to Link Aggregation
Link aggregation means aggregating several links together to form an aggregation
group, so as to implement outgoing/incoming load sharing among the member ports in
the group and to enhance the connection reliability.
Depending on different aggregation modes, aggregation groups fall into three types:
manual, static LACP, and dynamic LACP. Depending on whether or not load sharing is
implemented, aggregation groups can be load-sharing or non-load-sharing aggregation
groups.
Note:
Up to 384 aggregation groups can be created in a system, where up to 64 load-sharing
aggregation groups can be created.
For the member ports in an aggregation group, their basic configuration must be the
same. The basic configuration includes STP, QoS, VLAN, port attributes and other
associated settings.
z STP configuration, including STP status (enabled or disabled), link attribute
(point-to-point or non-point-to-point), STP priority, STP path cost, STP standard
packet format, maximum transmission speed, loop guard status, root guard status,
edge port or not.
z QoS configuration, including traffic rate limiting, priority marking, default 802.1p
priority, bandwidth assurance, congestion avoidance, traffic redirection, traffic
statistics, and so on.
z VLAN configuration, including permitted VLANs, and default VLAN ID.
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-2
z Port attribute configuration, including port rate, duplex mode, and link type (Trunk,
Hybrid or Access). The ports for a manual or static aggregation group must have
the same link type, and the ports for a dynamic aggregation group must have the
same rate, duplex mode and link type.
1.1.2 Introduction to LACP
The purpose of Link Aggregation Control Protocol (LACP) is to implement dynamic link
aggregation and deaggregation. This protocol is based on IEEE802.3ad and uses
LACP data units (LACPDUs) to interact with its peer.
After LACP is enabled on a port, LACP notifies the following information of the port to its
peer by sending LACPDUs: priority and MAC address of this system, port priority, port
number and operation key of the port. After the peer port receives the information, the
peer collects the information received by all its ports and compares the information to
determine the ports that can be aggregated.
1.1.3 Operation Key
An operation key is a configuration combination generated by the system depending on
the configurations of the port (rate, duplex mode, basic configuration, and management
key) when the port is aggregated.
1) The selected ports in a manual/static aggregation group have the same operation
key.
2) The management key of an LACP-enabled static aggregation port is equal to its
aggregation group ID.
3) The management key of an LACP-enabled dynamic aggregation port is zero by
default.
4) The member ports in a dynamic aggregation group have the same operation key.
1.1.4 Manual Aggregation Group
I. Introduction to manual aggregation group
A manual aggregation group is manually created. All its member ports are manually
added and can be manually removed (it inhibits the system from automatically
adding/removing ports to/from it). Each manual aggregation group must contain at least
one port. When a manual aggregation group contains only one port, you cannot remove
the port unless you remove the whole aggregation group.
LACP is disabled on the ports of manual aggregation groups, and you cannot enable
LACP on a port of a manual aggregation group.
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-3
II. Port status in manual aggregation group
A port in a manual aggregation group can be in one of the two states: selected or
standby. The selected port with the minimum port number serves as the master port of
the group, and other selected ports serve as member ports of the group.
There is a limit on the number of selected ports in an aggregation group. Therefore, if
the number of ports that can be set as selected ports in an aggregation group exceeds
the maximum number supported by the device, the system will choose the ports with
lower port numbers as the selected ports, and set others as standby ports.
III. Requirements on ports for manual aggregation
Generally, there is no limit on the rate and duplex mode of the ports you want to add to
a manual aggregation group. However, note the following cases:
z For the ports which are initially down, there is no limit on the rate and duplex mode
of the ports when they are added to an aggregation group;
z For the currently down ports which used to be up and whose rate and duplex mode
are specified in the negotiation mode or mandatory mode, the rate and duplex
mode of each port must be the same as those of the selected ports in the manual
aggregation group;
z When the rate and duplex mode of a port in the manual aggregation group change,
the system does not deaggregate the aggregation group and all the ports in the
group work normally. However, if the rate of the master port decreases and the
duplex mode of the master port changes, packet loss may occur on the port.
1.1.5 Static LACP Aggregation Group
I. Introduction to static LACP aggregation
A static LACP aggregation group is also manually created. All its member ports are
manually added and can be manually removed (it inhibits the system from
automatically adding/removing ports to/from it). Each static aggregation group must
contain at least one port. When a static aggregation group contains only one port, you
cannot remove the port unless you remove the whole aggregation group.
LACP is enabled on the member ports of static aggregation groups, and you cannot
disable LACP on such a port. When you remove a static aggregation group, the system
will remain the member ports of the group in LACP-enabled state and re-aggregate the
ports to form one or more dynamic LACP aggregation groups.
II. Port status of static aggregation group
A port in a static aggregation group can be in one of the two states: selected or standby.
Both the selected and the standby ports can transceive LACP protocol packets
however, the standby ports cannot forward user packets.
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-4
Note:
In an aggregation group, the selected port with the minimum port number serves as the
master port of the group, and other selected ports serve as member ports of the group.
In a static aggregation group, the system sets the ports to selected or standby state
according to the following rules:
z The system sets the "most preferred" ports (that is, the ports take most
precedence over other ports) to selected state, and others to standby state. Port
precedence descends in the following order: full duplex/high speed, full duplex/low
speed, half duplex/high speed, half duplex/low speed.
z The system sets the state of the following ports to "standby": port connected to a
peer device different from the one the master port is connected to; port connected
to the same peer device as the master port but to a peer port that is not in the
same aggregation group as the peer port of the master port.
z The system sets the ports unable to aggregate with the master port (due to some
hardware limit, for example, cross-board aggregation unavailability) to standby
state.
z The system sets the ports with basic port configuration different from that of the
master port to standby state.
There is a limit on the number of selected ports in an aggregation group. Therefore, if
the number of the member ports in an aggregation group exceeds the maximum
number supported by the device, the system will choose the member ports with lower
port numbers as the selected ports, and set others as standby ports.
Note:
For the restriction of LPU types on link aggregation, refer to Table 1-2 and Table 1-3.
1.1.6 Dynamic LACP Aggregation Group
I. Introduction to dynamic LACP aggregation group
A dynamic LACP aggregation group is automatically created and removed by the
system. Users cannot add/remove ports to/from it. Ports can be aggregated into a
dynamic aggregation group only when they are connected to the same peer device and
have the same basic configuration, and the same rate and duplex mode.
Besides multiple-port aggregation groups, the system is also able to create single-port
aggregation groups, each of which contains only one port. LACP is enabled on the
member ports of dynamic aggregation groups.
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-5
II. Port status of dynamic aggregation group
A port in a dynamic aggregation group can be in one of the two states: selected or
standby. In a dynamic aggregation group, both the selected and the standby ports can
transceive LACP protocol packets; however, the standby ports cannot forward user
packets.
There is a limit on the number of selected ports in an aggregation group. Therefore, if
the number of the member ports in an aggregation group exceeds the maximum
number supported by the device, the system will negotiate with its peer end, to
determine the states of the member ports according to the IDs of ports of the preferred
device (that is, the device with smaller system ID). The following is the negotiation
procedure:
1) Compare device IDs (system priority + system MAC address) between the two
parties. First compare the system priority of the two devices. If the system
priorities are equal, compare the MAC address of the two systems. The device
with smaller device ID will be considered as the preferred one.
2) Compare port IDs (port priority + port number) on the preferred device. The
comparison between two port IDs is as follows: First compare the two port
priorities, then the two port numbers if the two port priorities are equal; the port
with smaller port ID is a selected port and the other port is a standby port.
In an aggregation group, the selected port with the minimum port number serves as the
master port of the group, and other selected ports serve as member ports of the group.
Note:
z The down ports in a static aggregation group or dynamic aggregation group are
standby ports, which is different in manual aggregation groups.
z For the restriction of LPU types on link aggregation, refer to Table 1-2 and Table
1-3.
1.1.7 Restriction of LPU types on Link Aggregation
Table 1-1 lists link aggregation types and related descriptions.
Note:
Type-A LPUs include the following specifications: LS81FT48A, LS81FM24A,
LS81FS24A, LS81GB8UA and LS81GT8UA.
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-6
Table 1-1 Link aggregation types and related descriptions
Aggregation
type
Basic
description
Specific description
Manual
aggregation
z For type-A LPUs, an aggregation group
supports up to 8 selected GE ports or 16
selected FE ports
z For non-type-A LPUs, an aggregation
group supports up to 8 selected GE ports
or 8 selected FE ports
Static/dynamic
aggregation
Support up to 384
aggregation
groups, including
64 load sharing
aggregation
groups
z For type-A LPUs, an aggregation group
supports up to 8 selected GE ports
z For type-A LPUs, an aggregation group
supports up to 24 FE ports, including up to
16 selected ones
z For non-type-A LPUs, an aggregation
group supports up to 48 ports, including
up to 8 selected ones
Table 1-2 and Table 1-3 describe the restriction of type-A LPUs and non-type-A LPUs
on link aggregation respectively.
Table 1-2 Restriction of type-A LPUs on link aggregation
LPU
type
Cross-chip
aggregation
Aggregation
type
LPU
specification
Maximum
number of
ports in an
aggregatio
n group
Maximum
number of
selected
ports in an
aggregatio
n group
LS81FT48A 16 16
LS81FM24A/
LS81FS24A
16 16
Manual
aggregation
LS81GB8UA/
LS81GT8UA
8 8
LS81FT48A 24 16
LS81FM24A/
LS81FS24A
24 16
Type-
A
LPU
Not
supported
Static/dynam
ic
aggregation
LS81GB8UA/
LS81GT8UA
8 8
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-7
Table 1-3 Restriction of non-type-A LPUs on link aggregation
LPU type
Cross-chip
aggregation
Aggregation
type
Maximum
number of
ports in an
aggregation
group
Maximum
number of
selected
ports in an
aggregation
group
Manual
aggregation
8 8
Non-type-A
LPU
Supported
Static/dynamic
aggregation
The number of
ports on the
LPU
8
1.1.8 Aggregation Group Categories
Depending on whether or not load sharing is implemented, aggregation groups can be
load-sharing or non-load-sharing aggregation groups.
In general, the system only provides limited load-sharing aggregation resources
(currently up to 64 load-sharing aggregation groups can be created), so the system
needs to reasonably allocate the resources among different aggregation groups.
The system always allocates hardware aggregation resources to the aggregation
groups with higher priorities. When load-sharing aggregation resources are used up by
existing aggregation groups, newly-created aggregation groups will be
non-load-sharing ones.
The priorities of aggregation groups for allocating load-sharing aggregation resources
are as follows:
z An aggregation group containing special ports (such as 10GE port) which require
hardware aggregation resources has higher priority than any aggregation group
containing no special port.
z A manual or static aggregation group has higher priority than a dynamic
aggregation group (unless the latter contains special ports while the former does
not).
z For two aggregation groups, the one that might gain higher speed if resources
were allocated to it has higher priority than the other one.
z If the two groups can gain the same speed after resources are allocated to them,
the one with smaller master port number has higher priority than the other one.
When an aggregation group of higher priority appears, the aggregation groups of lower
priorities release their hardware resources. For single-port aggregation groups, if they
can transceive packets normally without occupying aggregation resources, they will not
occupy hardware aggregation resources.
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-8
Caution:
A load-sharing aggregation group contains at least two selected ports, however, a
non-load-sharing aggregation group can have one selected port at most and others are
standby ports.
1.2 Link Aggregation Configuration
Caution:
z The following ports cannot be added to an aggregation group: destination ports to
be mirrored to, reflection ports of remote mirroring, ports configured with static MAC
addresses, static-ARP-enabled ports, and 802.1x-enabled ports.
z Ports where the IP-MAC address binding is configured cannot be added to an
aggregation group.
Note that:
1) When creating an aggregation group:
z If the aggregation group you are creating already exists but contains no port, its
type will change to the type you set.
z If the aggregation group you are creating already exists and contains ports, the
possible type changes may be: changing from dynamic or static to manual, and
changing from dynamic to static; and no other kinds of type change can occur.
z When you change a dynamic/static group to a manual group, the system will
automatically disable LACP on the member ports. When you change a dynamic
group to a static group, the system will remain the member ports LACP-enabled.
2) When a manual or static aggregation group contains only one port, you cannot
remove the port unless you remove the whole aggregation group.
1.2.1 Configuring a Manual Aggregation Group
You can create a manual aggregation group through the following operations. And you
can remove an existing manual aggregation group. After that, all the ports in the group
are removed from the group).
A port can only be manually added/removed to/from a manual aggregation group.
Follow these steps to configure a manual aggregation group:
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-9
To do… Use the command… Remarks
Enter system view
system-view
—
Create a manual
aggregation group
link-aggregation group
agg-id mode manual
Required
Add a group of ports to the
manual aggregation
group
link-aggregation
interface-type
interface-number to
interface-type
interface-number [ both ]
Optional
Configure a description
for the aggregation group
link-aggregation group
agg-id description
agg-name
Optional
By default, an aggregation
group has no description.
Enter Ethernet port view
interface interface-type
interface-num
—
Add the port to the
aggregation group
port link-aggregation
group agg-id
Required
1.2.2 Configuring a Static LACP Aggregation Group
You can create a static LACP aggregation group, or remove an existing static
aggregation group (after that, the system will re-aggregate the original ports in the
group to form one or more dynamic aggregation groups.).
A port can only be manually added/removed to/from a static aggregation group.
Follow these steps to configure a static LACP aggregation group:
To do… Use the command… Remarks
Enter system view
system-view
—
Create a static
aggregation group
link-aggregation group
agg-id mode static
Required
Configure a description
for the aggregation group
link-aggregation group
agg-id description
agg-name
Optional
By default, an aggregation
group has no description.
Enter Ethernet port view
interface interface-type
interface-number
—
Add the port to the
aggregation group
port link-aggregation
group agg-id
Required
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-10
Note:
For a static LACP aggregation group or a manual aggregation group, you are
recommended not to cross cables between the two devices at the two ends of the
aggregation group. For example, suppose port 1 of the local device is connected to port
2 of the peer device. To avoid cross-connecting cables, do not connect port 2 of the
local device to port 1 of the peer device. Otherwise, packets may be lost.
Note that:
z LACP cannot be enabled on a port in a manual aggregation group.
z You can add a LACP-enabled port to a manual aggregation group. In this case,
the system will disable LACP on the port automatically. And, when you add a
LACP-disabled port to a static aggregation group, the system will enable LACP on
the port automatically.
1.2.3 Configuring a Dynamic LACP Aggregation Group
A dynamic LACP aggregation group is automatically created by the system based on
LACP-enabled ports. The adding and removing of ports to/from a dynamic aggregation
group are automatically accomplished by LACP.
You need to enable LACP on the ports whom you want to participate in dynamic
aggregation of the system, because, only when LACP is enabled on those ports at both
ends, can the two parties reach agreement in adding/removing ports to/from dynamic
aggregation groups.
Note:
LACP cannot be enabled on a port of a manual aggregation group.
Follow these steps to configure a dynamic LACP aggregation group:
To do… Use the command… Remarks
Enter system view
system-view
—
Configure a description
for an aggregation group
link-aggregation group
agg-id description
agg-name
Optional
By default, an aggregation
group has no description.
Configure the system
priority
lacp system-priority
system-priority
Optional
By default, the system
priority is 32,768.
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-11
To do… Use the command… Remarks
Enter Ethernet port view
interface interface-type
interface-number
—
Enable LACP on the port
lacp enable
Required
By default, LACP is
disabled on a port.
Configure the port priority
lacp port-priority
port-priority
Optional
By default, the port priority
is 32,768.
Note:
If you use the save command to save the current configuration and then restart the
device, the configured manual/static aggregation groups and their descriptions still
exist, however, the dynamic aggregation groups will disappear and their descriptions
cannot be restored.
1.3 Displaying and Maintaining Link Aggregation
Configuration
To do… Use the command… Remarks
Display summary
information of all
aggregation groups
display link-aggregation
summary
Available in any
view
Display detailed
information of a specific
aggregation group
display link-aggregation verbose
agg-id
Available in any
view
Display the ID of the local
device
display lacp system-id
Available in any
view
Display link aggregation
details of a specified port
or port range
display link-aggregation
interface interface-type
interface-number | [ to
{ interface-type interface-number ]
Available in any
view
Clear LACP statistics
about a specified port or
port range
reset lacp statistics [ interface
interface-type interface-number [ to
interface-type interface-number ] ]
Available in user
view
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-12
1.4 Link Aggregation Configuration Example
I. Network requirements
z Switch A connects to Switch B with three ports (Ethernet 2/0/1 through Ethernet
2/0/3). It is required that incoming/outgoing load between the two switch can be
shared among the three ports.
z Adopt three different aggregation modes to implement link aggregation on the
three ports between switch A and B.
II. Network diagram
Switch A
Link aggregation
Switch B
Figure 1-1 Network diagram for link aggregation configuration
III. Configuration procedure
The following only lists the configuration on Switch A; you must perform the similar
configuration on Switch B to implement link aggregation.
z Adopt the manual aggregation mode
# Create manual aggregation group 1.
<H3C> system-view
System View: return to User View with Ctrl+Z
[H3C] link-aggregation group 1 mode manual
# Add Ethernet 2/0/1 through Ethernet 2/0/3 to aggregation group 1.
[H3C] interface ethernet2/0/1
[H3C-Ethernet2/0/1] port link-aggregation group 1
[H3C-Ethernet2/0/1] interface ethernet2/0/2
[H3C-Ethernet2/0/2] port link-aggregation group 1
[H3C-Ethernet2/0/2] interface ethernet2/0/3
[H3C-Ethernet2/0/3] port link-aggregation group 1
z Adopt the static LACP aggregation mode
# Create static aggregation group 1.
[H3C] link-aggregation group 1 mode static
Operation Manual – Link Aggregation
H3C S7500 Series Ethernet Switches Chapter 1
Link Aggregation Configuration
1-13
# Add Ethernet 2/0/1 through Ethernet 2/0/3 to aggregation group 1.
[H3C] interface ethernet2/0/1
[H3C-Ethernet2/0/1] port link-aggregation group 1
[H3C-Ethernet2/0/1] interface ethernet2/0/2
[H3C-Ethernet2/0/2] port link-aggregation group 1
[H3C-Ethernet2/0/2] interface ethernet2/0/3
[H3C-Ethernet2/0/3] port link-aggregation group 1
z Adopt the dynamic LACP aggregation mode
# Enable LACP on Ethernet 2/0/1 through Ethernet 2/0/3.
<H3C> system-view
[H3C] interface Ethernet2/0/1
[H3C-Ethernet2/0/1] lacp enable
[H3C-Ethernet2/0/1] interface Ethernet2/0/2
[H3C-Ethernet2/0/2] lacp enable
[H3C-Ethernet2/0/2] interface Ethernet2/0/3
[H3C-Ethernet2/0/3] lacp enable
Note that the three LACP-enabled ports can be aggregated into a dynamic aggregation
group to implement load sharing only when they have the same basic configuration,
rate and duplex mode.
/