Hui Zhang

Theory and New Primitives for Safely Connecting Routing Protocol Instances

By: 
Franck Le, Geoffrey G. Xie, and Hui Zhang
Appears in: 
CCR October 2010

Recent studies have shown that the current primitives for connecting multiple routing protocol instances (OSPF 1, OSPF 2, EIGRP 10, etc.) are pervasively deployed in enterprise networks and the Internet. Furthermore, these primitives are extremely vulnerable to routing anomalies (route oscillations, forwarding loops, etc.) and at the same time too rigid to support some of today’s operational objectives. In this paper, we propose a new theory to reason about routing properties across multiple routing instances. The theory directly applies to both link-state and vector routing protocols.

Practical, Distributed Channel Assignment and Routing in Dual-radio Mesh Networks

By: 
Aditya Dhananjay, Hui Zhang, Jinyang Li, and Lakshminarayanan Subramanian
Appears in: 
CCR October 2009

Realizing the full potential of a multi-radio mesh network involves two main challenges: how to assign channels to radios at each node to minimize interference and how to choose high throughput routing paths in the face of lossy links, variable channel conditions and external load. This paper presents ROMA, a practical, distributed channel assignment and routing protocol that achieves good multi-hop path performance between every node and one or more designated gateway nodes in a dual-radio network.

Shedding Light on the Glue Logic of the Internet Routing Architecture

By: 
Franck Le, Geoffrey G. Xie, Dan Pei, Jia Wang, and Hui Zhang
Appears in: 
CCR October 2008

Recent studies reveal that the routing structures of operational networks are much more complex than a simple BGP/IGP hierarchy, highlighted by the presence of many distinct instances of routing protocols. However, the glue (how routing protocol instances interact and exchange routes among themselves) is still little understood or studied.

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