某局点 S12516F-AF 端口流量打满 问题

不涉及

现场发现设备上RAGG111口（即HGE3/2/0/16）带宽达到峰值，之后将其shutdown后，业务恢复。

%Nov  8 12:24:07:008 2021 H3C DRVPLAT/2/DrvDebug: -Chassis=3-Slot=10;

 WARNING: Please check chassis 3 slot 2 Buffer! The buffer(1226, 1075517, 1375917) of chip 0 on chassis 3 slot 10 to port HGE3/2/0/16 is used up to 90%. The CoS field is 2.

<H3C>dis counters rate  outbound interface Route-Aggregation 111

Usage: Bandwidth utilization in percentage

Interface            Usage (%)   Total (pps)   Broadcast (pps)   Multicast (pps)

RAGG111                    100       8618324                --                --

1、现网在shutdown RAGG111之前，查业务路由信息如下，只有四个下一跳接口，其中RAGG107、108、110都位于1框，RAGG111位于3框。 

[H3C]dis ip routing-table vpn-instance UNDERLAY-HY6 10.229.160.201

Destination/Mask   Proto   Pre Cost        NextHop         Interface

10.229.160.0/24    BGP     20  0           10.228.255.53   RAGG107.103

                                                             10.228.255.57   RAGG111.103

                                                             10.228.255.61   RAGG108.103

                                                             10.228.255.77   RAGG110.103

2、由于业务都是从3框进入设备，交换机在IRF下对流量是本框优转，因此所有报文都哈希至RAGG111，导致带宽打满。

1、经确认，在出现问题前，BGP下配置了balance eibgp 4命令，只允许4条路由进行负载分担。

2、现网shutdown RAGG111，并修改为balance eibgp 8，允许8条路由负载，这时查业务路由信息如下，包括RAGG112-114（位于3框）这三个下一跳。这时故障才恢复。

[H3C]dis ip routing-table vpn-instance UNDERLAY-HY6 10.229.160.201

Destination/Mask   Proto   Pre Cost        NextHop         Interface

10.229.160.0/24    BGP     20  0           10.228.255.53   RAGG107.103

                                                             10.228.255.61   RAGG108.103

                                                             10.228.255.65   RAGG112.103

                                                             10.228.255.69   RAGG109.103

                                                             10.228.255.73   RAGG113.103

                                                             10.228.255.77   RAGG110.103

                                                             10.228.255.81   RAGG114.103

3、修改负载分担路由条数后，查接口流量如下，均正常哈希。、

RAGG112 54 4721668 -- -- 

RAGG113 41 3635762 -- -- 

RAGG114 42 3671197 -- --  

4、本次故障并非设备问题，而是现网错误的配置了balance eibgp 4命令，导致部分下一跳接口不形成负载分担