HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 178
Configuring the SA cache mechanism, Displaying and maintaining MSDP
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Configuring the SA cache mechanism To reduce the time spent in obtaining the multicast information, you can enable the SA cache mechanism to cache (S, G) entries contained in SA messages locally on the router. However, caching (S, G) entries uses memory space on the router. When the SA cache mechanism is enabled and the router receives a new (*, G) join message, the router searches its SA cache first. • If the corresponding (S, G) entry does not exist in the cache, the router waits for the SA message that its MSDP peer will send in the next cycle. • If the corresponding (S, G) entry exists in the cache, the router joins the corresponding SPT rooted at S. To protect the router effectively against denial of service (DoS) attacks, you can set a limit on the number of (S, G) entries the router can cache. To configure the SA message cache: Step 1. Enter system view. 2. Enter MSDP view. Command system-view msdp 3. Enable the SA cache mechanism. cache-sa-enable 4. Configure the maximum number of (S, G) entries learned from the specified peer peer-address MSDP peer that the router can cache. sa-cache-maximum sa-limit Remarks N/A N/A Optional. Enabled by default. Optional. 8192 by default. Displaying and maintaining MSDP Step Command Remarks 1. Display brief information about MSDP peers. display msdp brief [ state { connect | down | listen | shutdown | up } ] [ | { begin | exclude | include } regular-expression ] Available in any view 2. Display detailed information about the status of MSDP peers. display msdp peer-status [ peer-address ] [ | { begin | exclude | include } regular-expression ] Available in any view 3. Display the (S, G) entry information in the SA cache. display msdp sa-cache [ group-address | source-address | as-number ] * [ | { begin | exclude | include } regular-expression ] Available in any view 4. Display the number of (S, G) entries in the SA cache. display msdp sa-count [ as-number ] [ | { begin | exclude Available in any view | include } regular-expression ] 5. Reset the TCP connection with an MSDP peer. reset msdp peer [ peer-address ] Available in user view 167
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