
C
HAPTER
13
| Security Measures
Access Control Lists
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precisely determined. It depends on the amount of hardware resources
reserved at runtime for this purpose.
Auto ACE Compression is a software feature used to compress all the
ACEs of an ACL to utilize hardware resources more efficiency. Without
compression, one ACE would occupy a fixed number of entries in TCAM.
So if one ACL includes 25 ACEs, the ACL would need (25 * n) entries in
TCAM, where “n” is the fixed number of TCAM entries needed for one
ACE. When compression is employed, before writing the ACE into
TCAM, the software compresses the ACEs to reduce the number of
required TCAM entries. For example, one ACL may include 128 ACEs
which classify a continuous IP address range like 192.168.1.0~255. If
compression is disabled, the ACL would occupy (128*n) entries of
TCAM, using up nearly all of the hardware resources. When using
compression, the 128 ACEs are compressed into one ACE classifying
the IP address as 192.168.1.0/24, which requires only “n” entries in
TCAM. The above example is an ideal case for compression. The worst
case would be if no any ACE can be compressed, in which case the used
number of TCAM entries would be the same as without compression. It
would also require more time to process the ACEs.
The order in which active ACLs are checked is as follows:
1.
User-defined rules in IP and MAC ACLs for ingress or egress ports are
checked in parallel.
2.
Rules within an ACL are checked in the configured order, from top to
bottom.
3.
If the result of checking an IP ACL is to permit a packet, but the result
of a MAC ACL on the same packet is to deny it, the packet will be
denied (because the decision to deny a packet has a higher priority for
security reasons). A packet will also be denied if the IP ACL denies it
and the MAC ACL accepts it.
S
ETTING
A
T
IME
R
ANGE
Use the Security > ACL (Configure Time Range) page to sets a time range
during which ACL functions are applied.
CLI R
EFERENCES
◆
C
OMMAND
U
SAGE
If both an absolute rule and one or more periodic rules are configured for
the same time range (i.e., named entry), that entry will only take effect if
the current time is within the absolute time range and one of the periodic
time ranges.
Содержание ECS4110-28T
Страница 1: ...Management Guide www edge core com ECS4110 28T 28P 52T 52P 28 52 Port Gigabit Ethernet Layer 2 Switch...
Страница 2: ......
Страница 4: ......
Страница 63: ...FIGURES 63 Figure 428 Configuring VLAN Translation 1177...
Страница 64: ...FIGURES 64...
Страница 72: ...TABLES 72...
Страница 74: ...SECTION I Getting Started 74...
Страница 102: ...SECTION II Web Configuration 102 General IP Routing on page 679...
Страница 154: ...CHAPTER 4 Basic Management Tasks Resetting the System 154...
Страница 198: ...CHAPTER 5 Interface Configuration VLAN Trunking 198 Figure 65 Configuring VLAN Trunking...
Страница 272: ...CHAPTER 9 Congestion Control Automatic Traffic Control 272...
Страница 286: ...CHAPTER 10 Class of Service Layer 3 4 Priority Settings 286...
Страница 420: ...CHAPTER 13 Security Measures DHCP Snooping 420...
Страница 566: ...CHAPTER 14 Basic Administration Protocols OAM Configuration 566...
Страница 638: ...CHAPTER 15 Multicast Filtering Multicast VLAN Registration for IPv6 638...
Страница 662: ...CHAPTER 16 IP Configuration Setting the Switch s IP Address IP Version 6 662...
Страница 678: ...CHAPTER 17 IP Services Configuring the PPPoE Intermediate Agent 678...
Страница 792: ...CHAPTER 21 System Management Commands Switch Clustering 792...
Страница 822: ...CHAPTER 23 Remote Monitoring Commands 822...
Страница 888: ...CHAPTER 24 Authentication Commands PPPoE Intermediate Agent 888...
Страница 968: ...CHAPTER 25 General Security Measures Port based Traffic Segmentation 968...
Страница 994: ...CHAPTER 26 Access Control Lists ACL Information 994...
Страница 1034: ...CHAPTER 28 Link Aggregation Commands Trunk Status Display Commands 1034...
Страница 1044: ...CHAPTER 29 Power over Ethernet Commands 1044...
Страница 1084: ...CHAPTER 33 UniDirectional Link Detection Commands 1084...
Страница 1090: ...CHAPTER 34 Address Table Commands 1090...
Страница 1194: ...CHAPTER 37 VLAN Commands Configuring Voice VLANs 1194...
Страница 1388: ...CHAPTER 42 CFM Commands Delay Measure Operations 1388...
Страница 1410: ...CHAPTER 44 Domain Name Service Commands 1410...
Страница 1420: ...CHAPTER 45 DHCP Commands DHCP Relay 1420...
Страница 1472: ...CHAPTER 46 IP Routing Commands IPv4 Commands 1472...
Страница 1474: ...SECTION IV Appendices 1474...
Страница 1502: ...COMMAND LIST 1502...
Страница 1513: ......
Страница 1514: ...ECS4110 28T ECS4110 28P ECS4110 52T ECS4110 52P E072014 ST R02 150200000929A...