Table of Contents
What is service sequence numbers?
You can use the service sequence-numbers command to insert sequence numbers into log files. This can be important when log entries are coming really quickly. In fact, they can come so quickly that they appear at the same time.
What is service TCP Keepalives in?
The TCP keepalives-in service generates keepalive packets on idle incoming network connections (initiated by remote host). This service allows the device to detect when the remote host fails and drop the session. If enabled, keepalives are sent once per minute on idle connections.
What is service Nagle?
The purpose of enabling the Nagle service is to facilitate a remote management Telnet/SSH connection to a router in the event that the network is experiencing an inordinate amount of congestion or the router’s CPU is bogged down as a result of a DOS attack.
What is Tcp_nodelay?
The TCP_NODELAY socket option allows your network to bypass Nagle Delays by disabling Nagle’s algorithm, and sending the data as soon as it’s available. Enabling TCP_NODELAY forces a socket to send the data in its buffer, whatever the packet size.
How do I enable Nagle algorithm?
To reenable Nagle’s algorithm, change the Data value for each of those newly created keys back to the default of 0 (zero).
How long is TCP keep-alive?
The TCP Keep-Alives, not to be confused with the HTTP Keep-Alive header, is a defined, optional TCP implementation in Request for Comments (RFC) 1122. The default is 1800 seconds. Note: For more information about TCP keep alive, refer to the Internet Engineering Task Force (RFC 1122).
What is So_keepalive?
The SO_KEEPALIVE socket option is designed to allow an application to enable keep-alive packets for a socket connection. To query the status of this socket option, call the getsockopt function. To set this option, call the setsockopt function with the following parameters.
What is Tcp_cork?
UDP_CORK is a UDP socket option that allows you to accumulate data, only transmitting it in a single datagram when the option is disabled. (There’s also the similar MSG_MORE flag for send that behaves similarly, accumulating data until a call is performed without the flag, as well as TCP_CORK for TCP).
How do I disable service sequence numbers?
To disable sequence numbers, use the no service sequence-numbers global configuration command. The follwoing example shows part of a logging display with sequence numbers enabled: You can limit messages that are displayed to the selected device by specifying the severity level of the message.
How are numbers used in a sequence object?
The sequence object generates numbers according to its definition, but the sequence object does not control how the numbers are used. Sequence numbers inserted into a table can have gaps when a transaction is rolled back, when a sequence object is shared by multiple tables, or when sequence numbers are allocated without using them in tables.
What is the edit distance of a service sequence?
Definition 8: Service sequence edit distance. The edit distance between two service sequences is the number of operations required to transform one sequence into the other. The operations include replacing one service with another, inserting one service, and deleting one service. In this chapter, we only consider replacing one service with another.
Why do I have gaps in my sequence numbers?
Sequence numbers inserted into a table can have gaps when a transaction is rolled back, when a sequence object is shared by multiple tables, or when sequence numbers are allocated without using them in tables. When created with the CACHE option, an unexpected shutdown, such as a power failure, can lose the sequence numbers in the cache.