Debugging

3.The transit node receives a Ring-Down-Flush-FDB message

In the meanwhile, the master node has received a Link-Down message from the switch at the other end of the broken link (in step 3 on page 48). Therefore, the master node realises that the ring is broken and acts accordingly. As part of the recovery process, the master node sends a Ring-Down-Flush-FDB message. The transit node receives this message and flushes its forwarding database.

This is the packet shown in step 4 on page 49 of the master node debug output.

EPSR Port1 Rx: 00e02b00 00040000 cd280619 8100e3e8 005caaaa 0300e02b 00bb0100 00541ee9 00000000 0000cd28 0619990b 00400107 03e80000 00000000 cd280619 00000000 02000000

EPSR Port1 Rx:

-----------------------------------------------------------------------

TYPE

= RING-DOWN-FLUSH-FDB

STATE

= FAILED

CTRL VLAN

= 1000

SYSTEM

=

00-00-cd-28-06-19

HELLO TIME

=

0

FAIL TIME

=

0

HELLO SEQ

=

0

 

 

 

-----------------------------------------------------------------------

Flush FDB EPSR: test vid: 2

4.The transit node sends a Link-Down message

The transit node realises that its port is down, sends a Link-Down message, sends a trap, and changes its state to Link-Down. The transit node sends this message some time after the link actually went down, because the ring ports are 1000M ports (see "Ports and Recovery Times" on page 30). Note that by this stage the ring has already changed topology to restore traffic flow. The master node detected the link failure by receiving a Link-Down message from the other side of the link.

This is the Link-Down message that the master switch received in step 5 on page 49.

Manager 9924-B>

 

EPSR

test, Port

2 port down

Flush FDB EPSR:

test vid: 2

Block EPSR:test

port:2 VLAN:2

EPSR

Port1 Tx:

00e02b00 00040000 cd24024f 8100e3e8 005caaaa 0300e02b

00bb0100

00542484 00000000

0000cd24

024f990b

00400108

03e80000

00000000

cd24024f

00000000 04000000

 

 

 

 

 

EPSR Port1 Tx:

-----------------------------------------------------------------------

TYPE

= LINK-DOWN

STATE

= LINK-DOWN

CTRL VLAN

= 1000

SYSTEM

=

00-00-cd-24-02-4f

HELLO TIME

=

0

FAIL TIME

=

0

HELLO SEQ

=

0

 

 

 

-----------------------------------------------------------------------

EPSR INFO: Send trap EPSR:test oldState:LINK-UP newState:LINK-DOWN nodeType:TRANSIT

EPSR test oldState:LINK-UP newState:LINK-DOWN

Page 54 AlliedWare™ OS How To Note: EPSR

Page 54
Image 54
Allied Telesis AT-9924SP-30 Transit node receives a Ring-Down-Flush-FDB message, Transit node sends a Link-Down message

AT-9924SP-30, AT-9924T-40, AT-8948, AT-9924T/4SP-A-20, X900-48FE-N specifications

Allied Telesis is a leading provider of networking solutions, renowned for its innovative technologies and high-performance networking equipment. Among its extensive product lineup, the X900-48FE-N, AT-9924T-40, AT-8948, AT-9924T/4SP-A-20, and AT-9924SP-30 stand out for their remarkable features and capabilities.

The X900-48FE-N is a robust layer 2/3 managed switch that features 48 Fast Ethernet ports. This model is particularly known for its energy efficiency and reliability, making it a suitable choice for enterprises with demanding networking needs. It supports a wide range of Layer 2 Ethernet switching technologies, including VLANs, Spanning Tree Protocol (STP), and Link Aggregation Control Protocol (LACP), which enhances network reliability and efficiency.

The AT-9924T-40 is a versatile switch designed for high-performance environments. It offers a rich set of features, including 24 Gigabit Ethernet ports and 4 SFP ports for fiber connectivity. This device is equipped with Advanced Layer 2 and Layer 3 features, including IPv4/IPv6 support, Quality of Service (QoS) capabilities, and robust security options. This switch is ideal for core and distribution deployments within enterprise networks, ensuring fast and reliable connectivity.

The AT-8948 is another important model in Allied Telesis' offerings. It features 48 10/100 Mbps Ethernet ports and 4 Gigabit uplink ports, providing a high density of connectivity options. The AT-8948 is also equipped with advanced management capabilities, including SNMP, RMON, and web-based management, allowing for easy configuration and monitoring of the network.

The AT-9924T/4SP-A-20 offers a combination of 24 Gigabit Ethernet ports and 4 SFP slots to extend network capabilities through fiber connections. It is particularly well-suited for environments requiring high bandwidth and flexible connectivity. Its compact design makes it an excellent choice for data centers and enterprise networks.

Lastly, the AT-9924SP-30 is characterized by its 24 Gigabit SFP ports, offering flexibility in terms of fiber connectivity. This switch supports advanced routing capabilities and is designed for high-availability environments. Its ability to handle diverse network traffic while maintaining optimal performance makes it a valuable asset for any modern enterprise.

In summary, these Allied Telesis models showcase advanced features, network reliability, and versatile management options, making them critical components for efficient and scalable networking solutions.