Advanced Configuration and Management Guide

 

Table 10.1: Maximum Memory Usage

 

 

Platform

Maximum Memory BGP4

 

Can Use

 

 

Management module with 32 MB

7 MB

Note: This amount also applies to HP 6308M-SX routing switches with 32 MB.

Redundant Management module with 128 MB

62 MB

The memory amounts listed in the table are for all BGP4 data, including routes received from neighbors, BGP route advertisements (routes sent to neighbors), and BGP route attribute entries. The routes sent to and received from neighbors use the most BGP4 memory. Generally, the actual limit to the number of neighbors, routes, or route attribute entries the device can accommodate depends on how many routes the routing switch sends to and receives from the neighbors.

In some cases, where most of the neighbors do not send or receive a full BGP route table (about 80,000 routes), the memory can support a larger number of BGP4 neighbors. However, if most of the BGP4 neighbors send or receive full BGP route tables, the number of BGP neighbors the memory can support is less than in configurations where the neighbors send smaller route tables.

Memory Configuration Options Obsoleted by Dynamic Memory

Devices that support dynamic BGP4 memory allocation do not require or even support static configuration of memory for BGP4 neighbors, routes, or route attributes. Consequently, the following CLI commands and equivalent Web management options are not supported on these devices:

•max-neighbors <num>

•max-routes <num>

•max-attribute-entries <num>

If you boot a device that has a startup-config file that contains these commands, the software ignores the commands and uses dynamic memory allocation for BGP4. The first time you save the device’s running configuration (running-config) to the startup-config file, the commands are removed from the file.

Configuring BGP4

To begin using BGP4 on the routing switch, follow the steps outlined below:

1.Optionally define the router ID.

2.Enable the BGP4 feature on the routing switch.

3.Set the local AS number.

4.Identify the HP routing switch’s BGP4 neighbors and the ASs they are in.

5.Optionally change the Keep Alive Time and Hold TIme.

6.Optionally enable fast external fallover.

7.Optionally change the maximum number of BGP4 load sharing paths.

8.Optionally specify a list of individual networks in the local AS to be advertised to remote ASs using BGP4.

9.Optionally change the default local preference, default information originate, default MED (metric), or administrative distances. (You change these parameters independently of one another.)

10.Optionally configure the routing switch to always compare MEDs (metrics) when choosing a route.

11.Optionally enable synchronization of routes between BGP4 and IGP.

10 - 10