L3 Routing Protocols
SUMMARY Read this topic to know about the L3 routing protocols that are supported by the Juniper Cloud Native Router, including BGP, IS-IS, and OSPF.
Supported L3 protocols
The Juniper Cloud-Native router supports the following L3 routing protocols, each of which can be configured via node annotations at the time of deployment or via the cRPD CLI for a running cRPD pod. Here is an example configuration snippet from the go template with node annotations:
protocols {
isis {
interface all;
{{if and .Env.SRGB_START_LABEL .Env.SRGB_INDEX_RANGE}}
source-packet-routing {
srgb start-label {{.Env.SRGB_START_LABEL}} index-range {{.Env.SRGB_INDEX_RANGE}};
node-segment {
{{if .Node.srIPv4NodeIndex}}
ipv4-index {{.Node.srIPv4NodeIndex}};
{{end}}
{{if .Node.srIPv6NodeIndex}}
ipv6-index {{.Node.srIPv6NodeIndex}};
{{end}}
}
}
{{end}}
level 1 disable;
}
}-
BGP—BGP is an exterior gateway protocol (EGP) that is used to exchange routing information among routers in different autonomous systems (ASs). BGP routing information includes the complete route to each destination. BGP uses the routing information to maintain a database of network reachability information, which it exchanges with other BGP systems. BGP uses the network reachability information to construct a graph of AS connectivity, which enables BGP to remove routing loops and enforce policy decisions at the AS level. The cloud-native router supports BGP version 4. Refer the BGP User Guide for more information.
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IS-IS—The IS-IS protocol is an interior gateway protocol (IGP) that uses link-state information to make routing decisions. IS-IS is a link-state IGP that uses the shortest-path-first (SPF) algorithm to determine routes. IS-IS evaluates the topology changes and determines whether to perform a full SPF recalculation or a partial route calculation (PRC). IS-IS uses hello packets that allow network convergence to occur quickly when network changes are detected. The cloud-native router supports IS-IS. Refer the IS-IS User Guide for information.
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OSPF—OSPF is an interior gateway protocol (IGP) that routes packets within a single autonomous system (AS). OSPF uses link-state information to make routing decisions, making route calculations using the shortest-path-first (SPF) algorithm (also referred to as the Dijkstra algorithm). Each router running OSPF floods link-state advertisements throughout the AS or area that contain information about that router’s attached interfaces and routing metrics. Each router uses the information in these link-state advertisements to calculate the least cost path to each network and create a routing table for the protocol. The cloud-native router supports OSPF version 2 (OSPFv2) and OSPF version 3 (OSPFv3). Refer the OSPF User Guide for more information.