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Knowledge Base

The block memory resource is not enough lead to the direct route unreachable

Publication Date:  2018-03-31  |   Views:  717  |   Downloads:  0  |   Author:  lWX511710  |   Document ID:  EKB1001451504

Contents

Issue Description

The topology is AR161 direct connect to AR1220,  assume the ip is 10.10.10.1/30 on AR161, ip 10.10.10.2/30 on AR1220. From AR1220 can ping 10.10.10.1, but from AR161 can't ping 10.10.10.1.

Alarm Information

None

Handling Process

1. check the ARP table, both router can learn the peer mac address;

2. check the acl ,do not configure any acl deny the peer ip;

3. check the block resource and find that the free block is zero.

[AR1220-diagnose]display block pool info
[AR1220-diagnose]
 CAP_MSS_MEM Block Pool information:
 Start Address: 0x46a00000
 Pool ID        : 3
 Page Size      : 131072
 Page Num       : 289
 Free Page Num  : 0
 First Free Page: 0x49f20000

4. check the acl/ routing-table/ fast forwarding table/session table, find that the fast forwarding table is very big and cost most of block resource.

display acl all

display session number

display session all

display ip fast-forwarding table number

display ip fast-forwarding table

display ip routing-table statistics

display ip routing-table

5. remove some business from the router, and make the block memory resource have surplus.

6. configure taffic policy filter some useless session;

Root Cause

Exhausted block memory resources

Solution

reduce the business or clear the tables, make the block resource is enough.

1. remove some business from the router, and make the block memory resource have surplus.

2. configure taffic policy filter some useless session;

Suggestions

when find the block memory resource is not enough, check which table or feature cost the block memory, and then analyze the table whether normally, if which table is abnormal, Make an in-depth analysis of that table.