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Fit AP V200R010C00 Command Reference

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
icmp blackhole unreachable send

icmp blackhole unreachable send

Function

The icmp blackhole unreachable send command enables the BRAS to send a Destination Unreachable ICMP packet to an initiator when a tracert packet matches an IPv4 blackhole route.

The undo icmp blackhole unreachable send command disables the BRAS from sending a Destination Unreachable ICMP packet to an initiator when a tracert packet matches an IPv4 blackhole route.

By default, the BRAS is disabled from sending a Destination Unreachable ICMP packet to an initiator when a tracert packet matches an IPv4 blackhole route.

Format

icmp blackhole unreachable send

undo icmp blackhole unreachable send

Parameters

None

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

If static IPv4 blackhole routes are configured on the BRAS and a user goes offline, only the IPv4 blackhole route corresponding to the user's address segment exists on the BRAS. When a tracert packet matches the IPv4 blackhole route, the BRAS discards the packet. As a result, an initiator cannot detect that the user has gone offline.

After you run the icmp blackhole unreachable send command, the BRAS sends a Destination Unreachable ICMP packet to an initiator, notifying the initiator that the user has gone offline if a user goes offline and a tracert packet matches the IPv4 blackhole route.

Pre-configuration Tasks

Static IPv4 blackhole routes have been configured on the BRAS.

Example

# Enable the BRAS to send a Destination Unreachable ICMP packet to an initiator when a tracert packet matches an IPv4 blackhole route.

<Huawei> system-view
[Huawei] icmp blackhole unreachable send
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Updated: 2019-07-18

Document ID: EDOC1100064353

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