To enable the SNMP write community string on a device
Introduction:
IP SLAs can be configured directly on the device, or from the IP SLA dashlet (that is displayed in the IP SLA dashboard) if SNMP write credentials have been provided for the selected device.
To enable the SNMP write community string on a device:
Before configuring an IP SLA on a device, you will need to provide SNMP write credentials so that Entuity can write to that device. This is set when specifying the credentials of a device, either via the Asset Management page or the Asset Credential Management page:
- To add/modify a device via Asset Management
- To add/modify a credential via Asset Credential Management
The SNMP write community string can be specified on the following credential types:
- SNMP v1
- SNMP v1/2
- SNMP v2c
To add/create an IP SLA:
- Navigate to the IP SLA dashboard for the selected device and click Create IP SLA in the top right of the dashlet, or via the Overflow Menu.
- This will open the Add IP SLA window. When you select the IP SLA type in the Type field, the attribute fields below will update depending upon the selected type. Please see the articles here for details of each IP SLA type's attributes, or alternatively check the list below.
- Click OK to save, otherwise click Cancel.
The IP SLA operation types and their respective fields are as follows:
DHCP
The DHCP operation measures the Round Trip Time (RTT) taken to discover a DHCP Server and obtain a lease from it. After obtaining an IP address, Cisco IOS IP SLA releases the IP address that was leased by the server.
Field Name | Field Description |
---|---|
Operation Index | unique identifier of the operation. |
Name | IP SLA operation name. |
Type | type of operation to be performed. |
Frequency | duration between initiating each operation. This should not be a shorter duration than the value in the Timeout field. The minimum allowed value is 10 seconds. |
Tag | descriptive string used by Entuity to identify the operation target. |
Owner | creator of the operation. |
Protocol | protocol used by the operation. |
Source Address | IP address of the source. |
Target Address | IP address of the destination. |
Source Port |
port on the source device used by the operation. When set to 0 (default), the operation automatically selects any available port. When set to a specific port number, ensure that other operations on the same device do not use the same port because this can cause operations to fail. Note, this attribute has been removed from ENA v17.0 P09 and ENA v18.0 P01 upwards. |
Lifespan |
IP SLA operation interval, by default set to Yes. If set to Yes, the IP SLA exists forever on the device unless manually deleted. If set to No, the Lifetime in seconds field appears beneath, wherein you can input a value in seconds. When this time elapses, the operation is deleted and (if needed again) you will have to recreate it. |
VRF Name |
name of the MPLS IP VPN VRF. |
Timeout |
length of time (in seconds) that Entuity waits for a response from the IP SLA operation before marking it as timed-out. This should not be a duration greater than the value in the Frequency field. |
DNS
DNS response time is measured as the difference between the time taken to send a DNS request and receiving a reply.
Field Name | Field Description |
---|---|
Operation Index | unique identifier of the operation. |
Name | IP SLA operation name. |
Type | type of operation to be performed. |
Frequency | duration between initiating each operation. This should not be a shorter duration than the value in the Timeout field. The minimum allowed value is 10 seconds. |
Tag | descriptive string used by Entuity to identify the operation target. |
Owner | creator of the operation. |
Protocol | protocol used by the operation. |
Lifespan |
IP SLA operation interval, by default forever. I.e. once created, it exists forever on the device unless deleted by Entuity. You can enter a limited lifespan, by entering a value in seconds. When this time elapses, the operation and Entuity has to recreate it. |
VRF Name |
name of the MPLS IP VPN VRF. |
Timeout |
length of time (in seconds) that Entuity waits for a response from the IP SLA operation before marking it as timed-out. This should not be a duration greater than the value in the Frequency field. |
Target Address String |
address to resolve. |
Name Server |
IP address of name server. |
HTTP
HTTP supports the HTTP GET operation. It measures the RTT taken to connect and access data from an HTTP server.
Field Name | Field Description |
---|---|
Operation Index | unique identifier of the operation. |
Name | IP SLA operation name. |
Type | type of operation to be performed. |
Frequency | duration between initiating each operation. This should not be a shorter duration than the value in the Timeout field. The minimum allowed value is 10 seconds. |
Tag | descriptive string used by Entuity to identify the operation target. |
Owner | creator of the operation. |
Sub-Type | code that represents the specific type of RTT operation, i.e. HTTP Get. |
Protocol | protocol used by the operation. |
Source Address | IP address of the source. |
Source Port |
port on the source device used by the operation. When set to 0 (default), the operation automatically selects any available port. When set to a specific port number, ensure that other operations on the same device do not use the same port because this can cause operations to fail. Note, this attribute has been removed from ENA v17.0 P09 and ENA v18.0 P01 upwards. |
TOS | defines the IP type of service (TOS) byte for request packets. This attribute may also be used as a differentiated services code point (DSCP). |
Lifespan |
IP SLA operation interval, by default forever. I.e. once created, it exists forever on the device unless deleted by Entuity. You can enter a limited lifespan, by entering a value in seconds. When this time elapses, the operation and ENA has to recreate it. |
VRF Name |
name of the MPLS IP VPN VRF. |
Timeout |
length of time (in seconds) that Entuity waits for a response from the IP SLA operation before marking it as timed-out. This should not be a duration greater than the value in the Frequency field. |
HTTPVersion |
HTTP Version, e.g. "1.0" |
URL |
URL to retrieve. |
AdminCache |
Boolean - if true - download cached pages. |
Proxy |
URL of the proxy server. |
HTTP Raw
HTTP Raw requests IP SLAs requre the entire content of the HTTP request. HTTP Raw requests are more flexible than HTTP Get requests, allowing more configuration and access through proxy servers.
Field Name | Field Description |
---|---|
Operation Index | unique identifier of the operation. |
Name | IP SLA operation name. |
Type | type of operation to be performed. |
Frequency | duration between initiating each operation. This should not be a shorter duration than the value in the Timeout field. The minimum allowed value is 10 seconds. |
Tag | descriptive string used by Entuity to identify the operation target. |
Owner | creator of the operation. |
Sub-Type | code that represents the specific type of RTT operation, i.e. HTTP Get. |
Protocol | protocol used by the operation. |
Source Address | IP address of the source. |
Source Port |
port on the source device used by the operation. When set to 0 (default), the operation automatically selects any available port. When set to a specific port number, ensure that other operations on the same device do not use the same port because this can cause operations to fail. Note, this attribute has been removed from ENA v17.0 P09 and ENA v18.0 P01 upwards. |
TOS | defines the IP type of service (TOS) byte for request packets. This attribute may also be used as a differentiated services code point (DSCP). |
Lifespan |
IP SLA operation interval, by default forever. I.e. once created, it exists forever on the device unless deleted by Entuity. You can enter a limited lifespan, by entering a value in seconds. When this time elapses, the operation and Entuity has to recreate it. |
VRF Name |
name of the MPLS IP VPN VRF. |
Timeout |
length of time (in seconds) that Entuity waits for a response from the IP SLA operation before marking it as timed-out. This should not be a duration greater than the value in the Frequency field. |
HTTPVersion |
HTTP Version, e.g. "1.0" |
URL |
URL to retrieve. |
AdminCache |
Boolean - if true - download cached pages. |
Proxy |
URL of the proxy server. |
Admin String 1 to 5 |
strings stores the content of HTTP Raw request, when the request cannot fit into String 1 then it is split and put in Strings 1 through 5. |
ICMP Path Echo
ICMP Path Echo operation record statistics for each hop along the path that the IP SLAs operation takes to reach its destination. The ICMP Path Echo operation determines this hop-by-hop response time between a Cisco router and any IP device on the network by discovering the path using the traceroute facility. Response times are measured as the difference between the time taken to send a Path Echo request and receving the replies.
Using the statistics recorded for the response times and availability, the ICMP Path Echo operation can identify a hop in the path that is causing a bottleneck.
Field Name | Field Description |
---|---|
Operation Index | unique identifier of the operation. |
Name | IP SLA operation name. |
Type | type of operation to be performed. |
Frequency | duration between initiating each operation. This should not be a shorter duration than the value in the Timeout field. The minimum allowed value is 10 seconds. |
Tag | descriptive string used by Entuity to identify the operation target. |
Owner | creator of the operation. |
Protocol | protocol used by the operation. |
Source Address | IP address of the source. |
Target Address | IP address of the destination. |
Source Port |
port on the source device used by the operation. When set to 0 (default), the operation automatically selects any available port. When set to a specific port number, ensure that other operations on the same device do not use the same port because this can cause operations to fail. Note, this attribute has been removed from ENA v17.0 P09 and ENA v18.0 P01 upwards. |
RequestPacketSize | sets the protocol data size in the payload of the operation's request packet. |
TOS | defines the IP type of service (TOS) byte for request packets. This attribute may also be used as a differentiated services code point (DSCP). |
Lifespan |
IP SLA operation interval, by default forever. I.e. once created, it exists forever on the device unless deleted by Entuity. You can enter a limited lifespan, by entering a value in seconds. When this time elapses, the operation and Entuity has to recreate it. |
VRF Name |
name of the MPLS IP VPN VRF. |
Timeout |
length of time (in seconds) that Entuity waits for a response from the IP SLA operation before marking it as timed-out. This should not be a duration greater than the value in the Frequency field. |
TCP Connect
The Transmission Control Protocol (TCP) Connection operation discovers the time it takes to connect to the target device. This operation is useful for testing virtual circuit or application availability. The measured connection time is the difference between the time Entuity sends the ACK and the initial SYN.
When the target is a Cisco device with an enabled responder, then the operation makes a TCP connection to any known port number. When the destination is a non-Cisco IP host, then the target port number must be specified. This operation is useful in simulating connection times, e.g. to Telnet, SSH, SQL, HTTP.
Field Name | Field Description |
---|---|
Operation Index | unique identifier of the operation. |
Name | IP SLA operation name. |
Type | type of operation to be performed. |
Frequency | duration between initiating each operation. This should not be a shorter duration than the value in the Timeout field. The minimum allowed value is 10 seconds. |
Tag | descriptive string used by Entuity to identify the operation target. |
Owner | creator of the operation. |
Protocol | protocol used by the operation. |
Source Address | IP address of the source. |
Target Address | IP address of the destination. |
Source Port |
port on the source device used by the operation. When set to 0 (default), the operation automatically selects any available port. When set to a specific port number, ensure that other operations on the same device do not use the same port because this can cause operations to fail. Note, this attribute has been removed from ENA v17.0 P09 and ENA v18.0 P01 upwards. |
Target Port | target's port number. |
TOS | defines the IP type of service (TOS) byte for request packets. This attribute may also be used as a differentiated services code point (DSCP). |
Control Packets | when enabled (true), the operation sends control messages to a responder, residing on the target device to respond to the data request packets being sent by the source device. |
Lifespan |
IP SLA operation interval, by default forever. I.e. once created, it exists forever on the device unless deleted by Entuity. You can enter a limited lifespan, by entering a value in seconds. When this time elapses, the operation and Entuity has to recreate it. |
VRF Name |
name of the MPLS IP VPN VRF. |
Timeout |
length of time (in seconds) that Entuity waits for a response from the IP SLA operation before marking it as timed-out. This should not be a duration greater than the value in the Frequency field. |
UDP Echo
The User Datagram Protocol (UDP) Echo operation calculates UDP response times between a Cisco device and any IP enabled device. Response time is computed by measuring the time taken to send a datagram and receive a response from the destination device.
When the target is a Cisco router with an active responder, then Cisco IOS IP SLA can send a UDP datagram to any specified port number. When the destination is a non-Cisco IP host, then a port must be specified.
By default, the UDP Echo operation uses UDP port 7, although another port may be specified.
- clock synchronization between source and destination.
- an available Cisco IOS IP SLA responder on the destination device.
Field Name | Field Description |
---|---|
Operation Index | unique identifier of the operation. |
Name | IP SLA operation name. |
Type | type of operation to be performed. |
Frequency | duration between initiating each operation. This should not be a shorter duration than the value in the Timeout field. The minimum allowed value is 10 seconds. |
Tag | descriptive string used by Entuity to identify the operation target. |
Owner | creator of the operation. |
Protocol | protocol used by the operation. |
Source Address | IP address of the source. |
Target Address | IP address of the destination. |
Source Port |
port on the source device used by the operation. When set to 0 (default), the operation automatically selects any available port. When set to a specific port number, ensure that other operations on the same device do not use the same port because this can cause operations to fail. Note, this attribute has been removed from ENA v17.0 P09 and ENA v18.0 P01 upwards. |
Target Port | target's port number. |
TOS | defines the IP type of service (TOS) byte for request packets. This attribute may also be used as a differentiated services code point (DSCP). |
Control Packets | when enabled (true), the operation sends control messages to a responder, residing on the target device to respond to the data request packets being sent by the source device. |
Lifespan |
IP SLA operation interval, by default forever. I.e. once created, it exists forever on the device unless deleted by Entuity. You can enter a limited lifespan, by entering a value in seconds. When this time elapses, the operation and Entuity has to recreate it. |
VRF Name |
name of the MPLS IP VPN VRF. |
Timeout |
length of time (in seconds) that Entuity waits for a response from the IP SLA operation before marking it as timed-out. This should not be a duration greater than the value in the Frequency field. |
Interval |
IP SLA operation interval. |
UDP Jitter
The UDP Jitter operation measures delay, specifically inter-packet delay variance.
This operation is a superset of the UDP echo operation, measuring UDP RTT and per-direction delay variance (jitter).
- clock synchronization between source and destination.
- an available Cisco IOS IP SLA responder on the destination device.
Field Name | Field Description |
---|---|
Operation Index | unique identifier of the operation. |
Name | IP SLA operation name. |
Type | type of operation to be performed. |
Frequency | duration between initiating each operation. This should not be a shorter duration than the value in the Timeout field. The minimum allowed value is 10 seconds. |
Tag | descriptive string used by Entuity to identify the operation target. |
Owner | creator of the operation. |
Protocol | protocol used by the operation. |
Source Address | IP address of the source. |
Target Address | IP address of the destination. |
Source Port |
port on the source device used by the operation. When set to 0 (default), the operation automatically selects any available port. When set to a specific port number, ensure that other operations on the same device do not use the same port because this can cause operations to fail. Note, this attribute has been removed from ENA v17.0 P09 and ENA v18.0 P01 upwards. |
Target Port | target's port number. This object is applicable to udpEcho, tcpConnect and jitter probe. |
RequestPacketSize | sets the protocol data size in the payload of the operation's request. |
TOS | defines the IP Type Of Service (TOS) byte for request packets. This attribute may also be used as a Differentiated Services Code Point (DSCP). |
Control Packets | when enabled (true), the operation sends control messages to a responder, residing on the target device to respond to the data request packets being sent by the source device. |
Lifespan |
IP SLA operation interval, by default forever. I.e. once created, it exists forever on the device unless deleted by Entuity. You can enter a limited lifespan, by entering a value in seconds. When this time elapses, the operation and Entuity has to recreate it. |
VRF Name |
name of the MPLS IP VPN VRF. |
Timeout |
length of time (in seconds) that Entuity waits for a response from the IP SLA operation before marking it as timed-out. This should not be a duration greater than the value in the Frequency field. |
Interval |
interval between packets. |
Number Of Packets |
number of packets. |
UDP Jitter VoIP
The UDP Jitter VoIP operation simulates VoIP traffic, using common CODECs. The operation derives MOS and ICPIF voice quality scores between Cisco IOS devices on the network.
You can set thresholds against MOS and ICPIF values, directly against an IP SLA definition, a device or the Entuity server root.
- clock synchronization between source and destination.
- an available Cisco IOS IP SLA responder on the destination device.
Field Name | Field Description |
---|---|
Operation Index | unique identifier of the operation. |
Name | IP SLA operation name. |
Type | type of operation to be performed. |
Frequency | duration between initiating each operation. This should not be a shorter duration than the value in the Timeout field. The minimum allowed value is 10 seconds. |
Tag | descriptive string used by Entuity to identify the operation target. |
Owner | creator of the operation. |
Protocol | protocol used by the operation. |
Source Address | IP address of the source. |
Target Address | IP address of the destination. |
Source Port |
port on the source device used by the operation. When set to 0 (default), the operation automatically selects any available port. When set to a specific port number, ensure that other operations on the same device do not use the same port because this can cause operations to fail. Note, this attribute has been removed from ENA v17.0 P09 and ENA v18.0 P01 upwards. |
Target Port | target's port number. This object is applicable to udpEcho, tcpConnect and jitter probe. |
RequestPacketSize | sets the protocol data size in the payload of the operation's request. |
TOS | defines the IP Type Of Service (TOS) byte for request packets. This attribute may also be used as a Differentiated Services Code Point (DSCP). |
Lifespan |
IP SLA operation interval, by default forever. I.e. once created, it exists forever on the device unless deleted by Entuity. You can enter a limited lifespan, by entering a value in seconds. When this time elapses, the operation and Entuity has to recreate it. |
VRF Name |
name of the MPLS IP VPN VRF. |
Timeout |
length of time (in seconds) that Entuity waits for a response from the IP SLA operation before marking it as timed-out. This should not be a duration greater than the value in the Frequency field. |
CODEC |
CODEC type to be used with the jitter operation, either G.711 u-law, G.711 a-law, or G.729A. |
CODEC Interval |
inter-packet delay between packets, in milliseconds. This is applicable when the CODEC is set. |
CODEC Payload |
number of octets that must be placed into the Data portion of the message. This is applicable when CODEC is set. |
CODEC Num Packets |
number of packets that must be transmitted. This is applicable when CODEC is set. |
Advantage Factor |
also known as the access Expectation Factor. Used when calculating ICPIF, it places a value on the quality level a user expects from a particular type of service. By default it is set to zero. |
To edit an IP SLA:
- Navigate to the device for which the IP SLA has been configured, and open the IP SLA dashboard for the selected device.
- On the table of IP SLAs, select the IP SLA operation that you want to delete and click Edit IP SLA in the top right of the browser or via the Overflow Menu.
- This will open the Edit IP SLA window. Make your changes in the fields available (which are are described in the section above on adding a new IP SLA). Click OK to save your changes, otherwise click Cancel.
To delete an IP SLA:
- Navigate to the device for which the IP SLA has been configured, and open the IP SLA dashboard for the selected device.
- On the table of IP SLAs, select the IP SLA operation that you want to delete and click Delete via the Overflow Menu.
RESTful API:
Please see the following for help and information on managing IP SLA via Entuity RESTful API:
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