Cisco WS-C3560E-48TD-E-RF - Catalyst 3560E-48TD Switch Bedienungsanleitung Seite 81
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BRKCRS-3090
Cisco Public
EEM with Flexible NetFlow
81
Problem: CPU processing required to
respond to packets with TTL values of
one or less.
•(using TTL-exceeded packets)
Cannot forward a packet with a TTL
value Less than one.
Results in a Denial of Service attack
NetFlow Counters available for EEM
E.g. look for packets with Time To Live
(TTL) less than or equal to 1.
EEM can also be
configured to start
a wireshark capture
flow record ttl
match ipv4 ttl
match ipv4 protocol
match ipv4 source address
match ipv4 destination address
match transport source-port
match transport destination-port
collect counter bytes
collect counter packets
collect timestamp sys-uptime first
collect timestamp sys-uptime last
flow monitor ttl
record ttl
cache timeout inactive 20
cache timeout active 30
interface GigabitEthernet8/47
switchport access vlan 50
switchport mode access
ip flow monitor ttl input
event manager applet ttl
event nf monitor-name "ttl" event-type create event1 entry-value "2" field ipv4 ttl entry-op lt
action 1.0 syslog msg "TTL=1 frames from $_nf_source_address to $_nf_dest_address detected.“
action 2.6 cli command "conf t"
action 2.7 cli command "int gi 2/2"
action 2.8 cli command "shut"
Flexible NetFlow
Configuration
EEM Configuration
Packet TTL=1
REFERENCE
- Smart Install 3
- Smart Operations is: 4
- Operations 5
- Responder 6
- Even been hit by this? 8
- Or this? 9
- What is Smart Install? 10
- Smart Install Benefits 11
- Flood Activities 12
- WS-C3750X-24P 13
- TFTP server 13
- – Auto Install 14
- Smart Install Components 15
- How Smart Install Works 16
- • 6500 supports 32 clients 17
- • ISR supports 36 clients 17
- Smart Install Clients 18
- Smart Install Directors 18
- Common Deployment Scenarios 19
- Step by Step on the Director 20
- login local 21
- • Be Patient 23
- Smart Install – Lab Notes 24
- Director Database: 25
- Visibilty of the Clients 26
- Upgrading Multiple Switches 27
- What Else Does it Bring? 28
- For Remote Sites 30
- Smart Install Summary 31
- Automation is Good 33
- Existing 34
- Challenges 34
- ASP addresses by 34
- Auto Smartports – History 35
- CDP/LLDP 37
- Get Voice vlan config 37
- Macro Contents – IP PHONE 39
- conf t 40
- Auto Smart Ports - Timing 41
- Auto Smart Ports- the Basics 43
- Make Macros “sticky” 44
- Auto Smart Ports 45
- oui list 0000AA 46
- interface $INTERFACE 46
- Appending In-built Macros 47
- Device Classifier 49
- Security Likes consistency 50
- Humans like consistency 50
- Gi 1/48 51
- Vlan 2 - 192.168.7.0/24 51
- switchport vlan mapping 2 5 52
- ASP – The Next Generation 53
- Profiles in NX-OS) 54
- Auto Smart Ports – Summary 55
- Other Gems 57
- Capture 58
- EPC – Configuration 59
- EPC – Capture Export 61
- EPC for the 4500 62
- EPC 4500 Config and Output 63
- destination 64
- (from 12.4(23)T, 12.2(33)S) 66
- Config Management 67
- Network Automation 75
- EEM Basic Architecture 77
- Embedded Event Manager 78
- EEM with Flexible NetFlow 81
- EEM CLI Trigger 82
- Reload Reason 83
- Monitoring Failed SLAs 84
- You’ve Got Mail 87
- Some IP SLA Topologies … 88
- Use Watchdog timer 89
- EMM History 90
- What about system restart? 91
- Performance Monitor - 1 92
- Performance Monitor - 2 93
- Performance Monitor - 3 94
- Performance Monitor - 4 95
- EMM Tying it all Together 96
- Use Syslog Detector 97
- TCL (Tools Command Language) 99
- TCL Create the Script 100
- EEM Registration 101
- TCL Library and Script Load 102
- BRKCRS-3090 103
- Cisco Public 103
- Updating TCL Scripts 104
- EEM Scripting Community 105
- Other EEM Support Resources 106
- Dynamic problem solving 107
- Smart Operations Summary 108
- Q & A 109
- Complete Your Online Session 110
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