MPLS流量转发场景,S7700交换机Eth-Trunk流量负载分担不均衡

发布时间:  2015-11-01 浏览次数:  643 下载次数:  0
问题描述
S7700交换机两个端口配置为端口聚合Eth-Trunk 5,两个端口流量相差较大,负载不均衡
告警信息
处理过程

1.查看端口聚合Eth-Trunk5两个端口XG3/0/0和XG3/0/15端口状态,流量相差近一倍,存在负载不均问题;

[XX-S7703-A-Eth-Trunk5]dis int brief
PHY: Physical
*down: administratively down
^down: standby
(l): loopback
(s): spoofing
(E): E-Trunk down
(b): BFD down
(e): ETHOAM down
(dl): DLDP down
(d): Dampening Suppressed
InUti/OutUti: input utility/output utility
Interface                   PHY   Protocol InUti OutUti   inErrors  outErrors
Eth-Trunk1                  up    up         11%  2.82%       7189          0
  XGigabitEthernet1/0/3     up    up         11%  2.00%       7188          0
  XGigabitEthernet3/0/3     up    up         11%  3.63%          1          0
Eth-Trunk5                  up    up       8.72%    32%       3087          0
  XGigabitEthernet3/0/0     up    up       8.31%    22%       3087          0
  XGigabitEthernet3/0/15    up    up       9.12%    41%          0          0

2.通过查看端口的配置如下

[XX-S7703]dis cu int Eth-Trunk5
#
interface Eth-Trunk5
description TO_XX_S7703
port link-type trunk
undo port trunk allow-pass vlan 1
port trunk allow-pass vlan 10
stp disable
mode lacp
#
return
[XX-S7703]dis cu int XGigabitEthernet 3/0/0
#
interface XGigabitEthernet3/0/0
description XX-S7703-A_Xg3/0/11
eth-trunk 5
#
return
[XX-S7703]dis cu int XGigabitEthernet 3/0/15
#
interface XGigabitEthernet3/0/15
description XX-S7703-A _Xg_3/0/0
eth-trunk 5
return                                                                                                                                                        #
[XX-S7703]dis cu int vlanif10 
#
interface Vlanif10
description To_XX_S7703 
address 172.25.239.1 255.255.255.252
isis enable 1
mpls
mpls ldp

3.和客户确认该端口为MPLS业务流量,重新调整为增强型MPLS报文负载分担方式,问题解决;

load-balance-profile balance_mpls
mpls field top-label 2nd-label sip dip
#
interface Eth-Trunk5
load-balance enhanced profile balance_mpls

根因
现网场景为MPLS流量转发模型,而链路聚合端口默认情况下是根据src-dst-ip方式来负载分担的,需要更改为增强型MPLS报文负载分担方式。
建议与总结
实际组网中常会遇到端口聚合流量负载分担不均情况,要根据现网的流量情况选择相应的负载分担方式。

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