peer sa-cache-maximum

Function

The peer sa-cache-maximum command sets a maximum cache number for (S, G) entries learned from a specified Multicast Source Discovery Protocol (MSDP) peer.

The undo peer sa-cache-maximum command restores the default configuration.

By default, a maximum of 8192 (S, G) entries can be cached for a specified MSDP peer.

Format

peer peer-address sa-cache-maximum sa-limit

undo peer peer-address sa-cache-maximum

Parameters

Parameter	Description	Value
peer-address	Specifies the address of an MSDP peer.	The value is in dotted decimal notation.
sa-limit	Specifies the maximum number of (S, G) entries that can be cached.	The value is an integer ranging from 1 to 4294967295.

Parameter

Description

Value

peer-address

Specifies the address of an MSDP peer.

The value is in dotted decimal notation.

sa-limit

Specifies the maximum number of (S, G) entries that can be cached.

The value is an integer ranging from 1 to 4294967295.

Views

VPN instance MSDP view, MSDP view of a public network instance

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
msdp	write

Usage Guidelines

Usage Scenario

To protect a network against deny of service (DoS) attacks, run the peer sa-cache-maximum command to set a maximum cache number for (S, G) entries learned from an MSDP peer. Running this command for all MSDP peers is recommended.

Prerequisites

The multicast routing function has been enabled using the multicast routing-enable command in the public network instance view or VPN instance view.

MSDP peers have been configured, and the SA cache function has been enabled.

Configuration Impact

The total number of (S, G) entries that can be cached in the SA cache is limited by the specifications of the SA cache.

For (S, G) entries learned from a specific MSDP peer:

-If a maximum cache number is not set or is set to a value larger than the default value, a maximum number of the default value (S, G) entries can be cached for this peer.

If the specified maximum cache number is smaller than the default value, the specified value takes effect. Excess (S, G) entries are not cached or advertised to PIM-SM but can be forwarded through SA messages.

Example

# In the public network instance, specify 100 as the maximum cache number for (S, G) entries learned from the MSDP peer 10.10.7.6.

<HUAWEI> system-view
[~HUAWEI] interface loopback1
[*HUAWEI-LoopBack1] quit
[*HUAWEI] multicast routing-enable
[*HUAWEI] msdp
[*HUAWEI-msdp] peer 10.10.7.6 connect-interface LoopBack 1
[*HUAWEI-msdp] peer 10.10.7.6 sa-cache-maximum 100