Huawei S3700-28TP-PWR-SI 02354133 User Manual
Product codes
02354133
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Unidirectional traffic may cause unidirectional broadcast storms on the network. The SEP
protocol can prevent unidirectional broadcast storms because it can detect the unidirectional
traffic effectively.
protocol can prevent unidirectional broadcast storms because it can detect the unidirectional
traffic effectively.
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It supports the display of network topology. The network topology is displayed on the basis
of SEP segments.
of SEP segments.
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When the devices of other vendors are used on the network, the SEP can also prevent loops,
but does not need to be configured on these devices.
but does not need to be configured on these devices.
3.6 ERPS
On a Layer 2 switching network, packets will be generated and transmitted infinitely once a loop
occurs, causing a broadcast storm. All available bandwidth is consumed by the broadcast storm,
and therefore valid packets cannot be transmitted on the network.
occurs, causing a broadcast storm. All available bandwidth is consumed by the broadcast storm,
and therefore valid packets cannot be transmitted on the network.
Ethernet Ring Protection Switching (ERPS) is defined in ITU-T G.8032 Recommendation. It
prevents logical loops on a ring network by blocking redundant links.
prevents logical loops on a ring network by blocking redundant links.
ERPSv1 supports only the single-ring topology. When there is no faulty link on a ring network,
ERPS can eliminate loops on the network. When a link fails on the ring network, ERPS can
immediately restore the communication between the nodes on the network. Compared with other
ring network protocols, ERPS has the following advantages:
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ERPS can eliminate loops on the network. When a link fails on the ring network, ERPS can
immediately restore the communication between the nodes on the network. Compared with other
ring network protocols, ERPS has the following advantages:
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The network converges fast.
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ERPS is a standard protocol published by the ITU-T; therefore devices from different
vendors can communicate with each other when they run ERPS.
vendors can communicate with each other when they run ERPS.
3.7 Interface Security
Interface security is a security mechanism to control the access to a network. It checks whether
the source MAC addresses of data frames received on an interface are valid. When detecting
packets with invalid source MAC addresses, it takes certain actions to protect the interface.
the source MAC addresses of data frames received on an interface are valid. When detecting
packets with invalid source MAC addresses, it takes certain actions to protect the interface.
After security protection is enabled on an interface, the S3700 considers the following types of
MAC addresses valid:
MAC addresses valid:
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Static MAC addresses that are manually configured
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Dynamic or static MAC addresses in the DHCP snooping table
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Dynamic MAC addresses that are learned before the number of learned MAC addresses
reaches the limit
reaches the limit
When the interface receives frames with invalid source MAC addresses, the S3700 triggers the
interface security function to discard the frames or generates an alarm according to the
configuration.
interface security function to discard the frames or generates an alarm according to the
configuration.
3.8 Link Detection
Link detection includes loopback detection and virtual cable test (VCT). They provide users
with two means to detect link faults on LANs.
with two means to detect link faults on LANs.
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Loopback detection is used to check whether loops exist on a LAN. The S-switch sends
specific packets to detect loopback on the entire LAN.
specific packets to detect loopback on the entire LAN.
S3700HI Ethernet Switches
Product Description
Product Description
3 Link Features
Issue 05 (2012-10-20)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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