软件定义网络中快速和一致的流更新策略

史久根; 杨旭; 刘雅丽; 孙立

doi:10.11999/JEIT200231

软件定义网络中快速和一致的流更新策略

doi: 10.11999/JEIT200231

合肥工业大学计算机与信息学院合肥 230009

基金项目: 国家重大科学仪器设备开发专项(2013YQ030595)

详细信息

作者简介:
史久根：男，1963年生，副教授，研究方向为嵌入式系统、计算机网络和软件定义网络

杨旭：男，1994年生，硕士生，研究方向为嵌入式系统和软件定义网络

刘雅丽：女，1996年生，硕士生，研究方向为软件定义网络和网络功能虚拟化

孙立：男，1993年生，硕士生，研究方向为软件定义网络和网络功能虚拟化

通讯作者:
杨旭　2018110930@mail.hfut.edu.cn

中图分类号: TP393
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-03
- 修回日期: 2020-09-22
- 网络出版日期: 2021-08-09
- 刊出日期: 2021-09-16

Fast and Consistent Flow Update in Software Defined Network

School of Computer and Information, Hefei University of Technology, Hefei 230009, China

Funds: The National Major Scientific Instruments Development Project (2013YQ030595)

摘要

摘要: 在软件定义网络中，为了实现各种网络性能优化目标，控制面需要频繁的对数据面进行更新。然而，由于数据面的异步性，不合理的更新将严重降低网络性能。针对此问题，该文提出一种快速和一致的流更新策略(FCFU)。该策略通过流分段减弱其原有的强依赖关系，使能并行更新，通过分析子流段与多个资源间的依赖关系得到总更新轮数较少的更新安排，最后基于延时队列完成一致性流更新。实验结果表明，与现有的流更新算法相比，该策略能够缩短流更新总时间达20.6%，同时保证了更新期间无拥塞和包乱序等问题的发生。
- 软件定义网络 /
- 流更新 /
- 一致性更新 /
- 无拥塞 /
- 包乱序
Abstract: In Software Defined Networks (SDN), in order to meet various network performance optimization goals, the control plane needs to frequently update the data plane. However, due to the asynchronous nature of the data plane, unreasonable updates will severely degrade network performance. To address this issue, a Fast and Consistent Flow Update (FCFU) strategy is proposed, which weakens the original strong dependency through flow segmentations and enables parallel updates. By analyzing the dependency relationship between sub-flow segments and multiple resources, the update schedule with less numbers of rounds is obtained. Finally, consistent flow update is achieved based on the delay queue. Experimental results show that, compared with the existing flow update algorithms, this strategy can shorten the total completion time of flow update by 20.6%, while ensuring that no congestion and packet reordering occur during the update period.
- Software Defined Network (SDN) /
- Flow update /
- Consistent update /
- Congestion-free /
- Packet reordering

HTML全文

图 1 流更新示例

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图 2 网络拓扑

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图 3 总更新时间

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图 4 乱序率

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图 5 计算时间

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表 1 流分割算法(算法1)

输入：${P_f},{P'_f}$
输出：${R_f}$
(1)　${R_f} \leftarrow \emptyset ,d = \emptyset $, s=first(${P'_f}$)
(2)　while $d \ne $ last(${P'_f}$) do
(3)　　d =common(${P'_f}$, ${P_f}$,s)
(4)　　$p$$ \leftarrow $${P_f}[s,d]$,$p'$$ \leftarrow $${P'_f}[s,d]$
(5)　　if $p \ne p'$ then
(6)　　　　${R_f} \leftarrow {R_f} \cup (p,p')$
(7)　　end if
(8)　　s=d
(9)　end while
(10)　return ${R_f}$

下载: 导出CSV

表 2 流更新规划算法(算法2)

输入：$S$ //子流段集合
输出：$U$ //更新规划
(1)　$U \leftarrow \varnothing$, $\bar S = S$, $j = 1$
(2)　sort $\bar S$ by ${b_f}$ of each $\forall s(f,i) \in \bar S$
(3)　while $\bar S \ne \varnothing $ do
(4)　　${u_j} \leftarrow \varnothing $
(5)　　for each $s(f,i)$ in $\bar S$ do
(6)　　　if $\forall (u,v) \in {p'_{f,i}}$, ${h}_{j}(u,v){+}{b}_{f}\le {C}_{u,v}$ and 　　　　　 $\forall v \in {p'_{f,i}}[{\rm{1:}} - {\kern 1pt} {\rm{1}}]$, ${z}_{j}(v)+1 \le {L}_{v}$ then
(7)　　　　${u_j} \leftarrow {u_j} \cup s(f,i)$
(8)　　　　$\forall (u,v) \in {p'_{f,i}}$,${h_j}(u,v) = {h_j}(u,v) + {b_f} $
(9)　　　　$\forall v \in {p'_{f,i}}[{\rm{1:}} - {\kern 1pt} {\rm{1}}]$, ${z_j}(v) = {z_j}(v) + 1$
(10)　　　end if
(11)　　end for
(12)　　if ${u_j} = \varnothing $ and $\bar S \ne \varnothing $ then
(13)　　　calculate ${\pi _{f,i}}$ for each $s(f,i)$ in $\bar S$
(14)　　　${u_j}$$ \leftarrow $ select the $s(f,i)$ with minimal ${\pi _{f,i}}$
(15)　　end if
(16)　　$U \leftarrow U \cup \{ {u_j}\} $, update $({u_j})$
(17)　　for each $s(f,i)$ in ${u_j}$ do
(18)　　　$\forall (u,v) \in {p_{f,i}}$, ${h_j}(u,v) = {h_j}(u,v) - {b_f} $
19:　　　$\forall v \in {p_{f,i}}[{\rm{1:}} - {\kern 1pt} {\rm{1}}]$, ${z_j}(v) = {z_j}(v) - 1$
(20)　　end for
(21)　　remove all elements of ${u_j}$ from $\bar S$
(22)　　$j = j + 1$
(23)　end while
(24)　return $U$

下载: 导出CSV

表 3 子流段更新算法(算法3)

输入：$u$ //子流段集合
(1)　for each $s(f,i)$ in $u$ do
(2)　　${d_o}$$ \leftarrow $ delay of old path
(3)　　${d_n}$$ \leftarrow $ delay of new path
(4)　　add rules in reverse order
(5)　　if ${d_o}$>${d_n}$ then
(6)　　　set delay queue
(7)　　end if
(8)　　modify rule
(9)　　if ${d_o}$>${d_n}$ then
(10)　　　wait for $({d_o} - \,{d_n})$ ms
(11)　　　unset delay queue
(12)　　end if
(13)　　wait for ${d_n}$ ms
(14)　　delete rules in forward order
(15)　end for

下载: 导出CSV

表 4 丢包率(%)

流数量	OneShot	FCFU	Wu等人
150	0.91	0	0
200	0.85	0	0
250	0.89	0	0.02

下载: 导出CSV

表 5 更新轮数

流数量	4000	5000	6000	7000	8000
FCFU	24	35	35	27	35
Wu等人	63	57	82	64	53

下载: 导出CSV

参考文献(17)

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