In at the moment’s globalized world, prospects have began to take care of and develop their presence within the cloud throughout completely different geographic areas. With these elevated deployments throughout Azure areas comes the elevated complexity of shoppers’ hybrid networks. Establishing connectivity is not so simple as exchanging IP addresses between one pair of Azure areas and on-premises places. Connectivity now requires extra configuration and reconfiguration of IP prefixes and route filters over time because the variety of areas and on-premises places grows. The introduction of Border Gateway Protocol (BGP) group assist for Azure ExpressRoute, now in preview, lifts this burden for patrons who join privately to Azure. The assist of this function may even assist simplify and unlock new community designs.
A short overview of ExpressRoute
ExpressRoute lets prospects prolong their on-premises networks into the Microsoft Cloud over a non-public connection. With ExpressRoute, prospects can hook up with providers within the Microsoft Cloud, together with Microsoft Azure and Microsoft 365, with out going over the general public web. An ExpressRoute connection supplies extra reliability, decrease latency, and better safety than a public web connection.
Globalized hybrid networks with ExpressRoute
A standard situation for patrons to make use of ExpressRoute is to entry workloads deployed of their Azure digital networks. ExpressRoute facilitates the change of Azure and on-premises non-public IP handle ranges utilizing a BGP session over a non-public connection, enabling a seamless extension of shoppers’ current networks into the cloud.
When a buyer begins utilizing a number of ExpressRoute connections to a number of Azure areas, their visitors can take multiple path. The hybrid community structure diagram under demonstrates the emergence of suboptimal routing when establishing a mesh community with a number of areas and ExpressRoute circuits:
To make sure that visitors to Area A takes the optimum path over ExpressRoute circuit 1, the shopper might configure a route filter on-premises to make sure that Area A routes are solely realized on the buyer edge from ExpressRoute circuit 1, and never realized in any respect by ExpressRoute circuit 2. This strategy makes the shopper preserve a complete record of IP prefixes in every area and should frequently replace this record each time new digital networks are added and personal IP handle house is expanded within the cloud. Because the buyer continues to develop their presence within the cloud, this burden can develop into extreme.
Simplifying routing with BGP communities
With the introduction of BGP group assist for ExpressRoute, prospects can simply develop their multiregional hybrid networks with out the tedious work of sustaining IP prefix lists. A BGP group is a gaggle of IP prefixes that share a typical property referred to as a BGP group tag or worth. In Azure, prospects can now:
As soon as these values are configured on prospects’ digital networks, ExpressRoute will protect them on the corresponding non-public IP prefixes shared with prospects’ on-premises. When these prefixes are realized on-premises, they’re realized together with the configured BGP group values. For instance, a buyer can set the customized worth of 12076:10000 on a digital community in East US after which begin receiving the digital community prefixes together with the values of 12076:1000 and 12076:50004 (the regional worth) on-premises. Prospects can then configure their route filters based mostly on these group values as a substitute of by specifying IP prefixes.
With the flexibility to make routing choices on-premises based mostly on BGP communities, prospects not want to take care of IP prefix lists or replace their route filters every time they develop their handle house in an current area. As an alternative, they will filter based mostly on regional BGP group values and replace their configurations when deploying workloads in a brand new area.
Understanding advanced networks
Prospects might develop their Azure workloads throughout areas over time, as described earlier, however might also proceed to construct extra advanced networks inside every area. They could progress from less complicated single-virtual community deployments to pursuing hub-and-spoke or mesh topologies containing tons of of assets. If connectivity or efficiency points come up for visitors despatched from these assets to on-premises, the complexity of the cloud community could make troubleshooting tougher. With customized BGP group values configured on every digital community inside a area, a buyer can shortly discover the precise digital community that visitors is originating from in Azure and slim down their investigation accordingly.
Reap the benefits of customized BGP communities along with your Azure workloads
With the facility to simplify cross-regional hybrid community designs and pace up troubleshooting, customized BGP communities are an effective way for patrons to boost present ExpressRoute setups and put together for future progress.
Study extra about the best way to configure customized BGP communities to your personal hybrid networks.