MPLS + BGP advanced featuresWill LDP allocate tags for BGP routes? Why? --- Previously we mentioned that LDP assigns tags to IGP and never assigns tags to BGP. the following uses an experiment to illustrate how LDP + BGP works. forwarding method of a pure IP Network: In this topology, R1 and R4 establish an EBGP neighb
Today, the BGP neighbor negotiation process found such a problem during the sorting process.
BGP has 5 types of messages
1. open (code 1): used to establish a connection, including the version number (such as BGP3/BGP4) Hold Time = 180 s (it is a negotiation process, subject to a small Hold Time ), router-ID (OSPF and BGP can be manually configured), AS number (r
This blog article describes how to modify the next hop attribute value of NEXT_HOP through BGP, including modifying the next-hop attribute through next-hop-self, use route-map to modify the NEXT_HOP attribute values of BGP routes.
1. You can change the next-hop attribute through next-hop-self.
When R5 is updated to the EBGP neighbor R2 BGP Route 5.5.5.0, N
, R1 in AS1, R2,R3,R4 in a large AS100 (R2,r3 in AS23, R4 in AS4), 5 in AS5.Standard Community Community Properties----A neighbor must open the transport Community propertiesR2#show Run | S Route-mapRoute-map AA Permit 10Match IP Address 1Set community Internet All-network can be passedRoute-map AA Permit 20Match IP Address 2Set community Local-as cannot outgoing small asRoute-map AA Permit 30Match IP Address 3Set community no-advertise cannot be passed to any neighborRoute-map AA Permit 40Match
[Experimental environment] liehuo.net
C3640-IK9O3S-M Version 12.4 (10) liehuo.net
[Tutorial Objective] veryhuo.com
Uses Full-mesh to resolve BGP routing black hole liehuo.net
[Experiment topology] liehuo.net
Liehuo.net
[Experiment description] lie # fire # Network
BGP distribution. R2, R3, and R4 run the OSPF protocol. The objective is to enable 1.1.1.1
BGP neig
Modify Weightrouter BGP 1 nrighbor [Address] weight 10 Modify single access-list 6 Permit 6.6.6.6N Bsp router-map XXX Permit 10 match IP address 6 N Bsp Set weight 20 router-map xxx permit 20router bap 1 neihgbor [address] Router-map xxx In2.local_preference:as Valid within, as within the pass, the default value is 100, compared to other as modified Local_preferenceroute-map XXX Permit 10 set local-preference 110router
In the IGP era, we all know, for example, OSPF, link state protocol, in the routing of the time, than the cost of the link, which link consumption will be more priority, if two of the same link consumption, then do load balancing.
In fact, the 2 principles to achieve the OSPF---shortest path first work principle.
What if, in BGP, there are multiple routes to achieve the goal, how should the choice be made? Which path is the preferred one?
Take a lo
BGP routing load balancing fault caseNetwork Architecture 1. Topology: the actual network structure is simplified considering the privacy of the company's network and a clearer description of fault phenomena. 2. network planning and data Configuration Overview: ◆ ASR9K establishes IBGP neighbor relationships with two n7ks Based on the interconnected addresses respectively; ◆ ASR9K is connected to the Cisco 752 architecture and 752 is used as the CDN s
1. Is the BGP Route table mentioned in the BGP protocol a BGP table? Which table does BGP actually use to route data packets? Is it a BGP table or an IP Route table? Are there any relationships between the two tables? For example, are some entries in the
Optional delivery-BGP Communities is a marker for routing entries to ensure continuity of routing filtering and selection-BGP routers can community the routing entries when redistribution, sending, and receiving routing updates (ROUTE-MAP)-Depending on the community value, the BGP router can filter incoming or outgoing routing updates or optimize certain routes-B
The BGP protocol is designed for routing between autonomous systems, but it can also be used inside autonomous systems and is a type of Dual Routing Protocol.
Two BGP adjacent nodes that can communicate between autonomous systems must exist on the same physical link.
BGP routers in the same autonomous system can communicate with each other to ensure that they sha
BGP Communities PropertiesThe community property of BGP is an optional transitive property, and routers that do not support this attribute pass the community value to the downstream BGP neighbor intact (provided that the delivery is configured Community property). the community attribute of BGP simplifies the matching
Key Issues
1) How does an ACL match route entries with the same subnet and different masks? How do I match entries with the same mask and different subnets?
2) Why does a summary route cause a tumble of BGP peers?
3) Why does the acl fail to match the route entry when attribite-map is used?
4) How to Use advertise-map, suppress-map, unsuppress-map, attribute-map, and route-map routing diagrams? Instance.
5) What are the two routing filtering solutions
1. Routes identified with R: IGP and BGP Learn the same route, but the IGP learns that the ad is smaller, and the route identifies the route that the R,r identity does not put in the routing table, but is still passed to the other neighbors. You can view the routes identified by the R by command show ip BGP rib-failure.2. Two methods of restarting BGP:Hard restart: Clear IP
Dynamic routing protocols are divided into Internal Gateway Protocol (IGP) and External Gateway Protocol (EGP), depending on whether they are used within an autonomous domain. The autonomous domain here refers to a network with a unified management authority and a unified routing policy. The routing protocol adopted within the autonomous domain is called the Internal Gateway Protocol, which is commonly used in RIPandOSPF, and theexternal Gateway protocol is mainly applied to routing between mult
CONFIG prefix-listRouter (config) #ip prefix-list list-name seq permit/deny network/len ge/lePrefix-list was originally designed for BGP. The network address part and mask portion of the routing entry can be matchedIP prefix-list NAME Permit 172.16.0.0/22 ge le 24/22: prefix 22bit the sameGe24: Mask range min. 24 bitsLe24: Mask range Max 24 bitsWhen there is no GE, the mask range is the smallest and the prefix is the sameWhen there is GE, there is no
Before we start, let's start by thinking about several questions.
What is a route? What are OSPF and BGP? What are their purposes? What are their application scenarios? What are the advantages of the two routing protocols in OpenBSD compared with hardware routers such as Cisco/Huawei? How to Use OpenBSD to reduce network costs?
1. What is a route?
Simply put, a route is like a sign at a crossroads, and an IP packet is like a car on the road. Wh
convenient route summary to reduce the consumption of device memory; on the other hand, the network instability is controlled locally to reduce the impact on the entire network and save CPU resources.
Therefore, Internal/External BGP architecture is a better solution.
3.2 network logical hierarchy
The core layer provides transmission functions to transmit route information and user traffic in each region.
Divide management domains by region and conne
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.