Table of Contents
What is BGP community list?
A BGP community list is used to create groups of communities to use in a match clause of a route map. A community list can be used to control which routes are accepted, preferred, distributed, or advertised, for example. You can also use a community list to set, append, or modify the communities of a route.
How do I check my BGP state?
On Cisco routers, the state of BGP sessions is shown in the State/PfxRcd column of the show ip bgp summary or show bgp ipv4 unicast summary commands (IPv4) or show bgp ipv6 unicast summary command (IPv6) output.
How do I check my BGP summary?
When graceful restart or LLGR helper mode is active, the RIB information is now displayed by the show bgp summary command. If a BGP session is established on the main routing device, the field shows the number of active, received, accepted, and damped routes that are received from a neighbor and appear in the inet.
What is BGP extended community?
An extended community is an 8-octet value and provides a larger range for grouping or categorizing communities. BGP extended community attributes are specified in RFC 4360. You define the extended community list using the ip extcommunity-list command.
How do I display BGP routing table?
show ip bgp
- Displays entries in the BGP routing table for one network prefix or the entire BGP routing table.
- Syntax: show ip bgp [prefix-length]
- Description: Use the show ip bgp command to display entries in the BGP routing table.
- Use the prefix-length keyword to display information for a single network prefix.
How can I tell if BGP is running?
For example, execute: show interfaces fastethernet 0/0 or show interfaces gigabitethernet 0/0 When the output is displayed, look at the interface that’s facing the BGP peer. You should be able to see a line where it says something like: Fast Ethernet 0/0 is up, line protocol is up.
What is community list?
What is BGP send community both?
What Is a BGP Community? A BGP community is an optional, transitive BGP attribute that is recognized and passed to other BGP peers. You might see a BGP community as a tag attached to the BGP routes exchanged between two BGP peers.
Is Route target an extended community?
The route target BGP Extended Community dictates the policies used by the VRF. The route target must be configured to specify the routes, which contain this specific route target value, that are imported into the VRF, and the route target that is added to the routes that are exported from the VRF.
What are the well known communities of the BGP community attribute?
Here are the 4 well known BGP communities:
- Internet: advertise the prefix to all BGP neighbors.
- No-Advertise: don’t advertise the prefix to any BGP neighbors.
- No-Export: don’t advertise the prefix to any eBGP neighbors.
- Local-AS: don’t advertise the prefix outside of the sub-AS (this one is used for BGP confederations).