Dpkt tutorial #4: As paths from MRT/BGP
Previusly we looked at creating ICMP echo requests, parsing a pcap file, and doing DNS Spoofing with the dpkt framework. today I will show how to parse the as paths of BGP messages out of MRT routing dumps.
Parsing BGP routing information is fun. however, before projects like routeviews were around und, getting a global vi
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
Topology experiment diagram:
650) this. width = 650; "src =" 51cto.com/uploads/allianz 111103/134944bq-0.jpg "title =" BGP backdoor routing "height =" 407 "width =" 606 "/> what is BGP backdoor routing? What is its function? Let's take a look at the brief Network Configuration:
R1
S0/0: ip add 12.1.1.1 255.255.255.0
S0/1: ip add 13.1.1.1 255.255.255.0
L0: ip add 1.1.1.1 255.255.255.0
Router
With the development of the Internet in China, the connection between ISP service providers and Internet is also changing. On a network connection, from a single connection to the Internet via multiple telecommunications companies, in terms of routing protocols used, from the use of static routing protocols to the use of BGP (Border Gateway Protocol). How does the ISP deploy the BGP routing protocol rationa
[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
Perform the following experiment in the previous IGP.
Lab requirements:
1. EBGP: R3---R2 R4---R3 R2---R1
2, IBGP: R2---R4 R4---R5 R2---R5
3. All BGP neighbor relationships are established using LO0 for update source (except for R2-R1 ). Use X. X. X.
X as the router-id
4. R3 announcement lo20: 200.200.1.0/24. R5 should select R2.
5. R5 announcement lo20: 200.200.5.0/24
The destination network.
6. R1 announcement lo20: 200.200.4.0/24. This route can onl
R1and theR2There are two wires connected, usingBGP,R1There are two sets of routes,192.168.1.0/24and the192.168.2.0/24, when the two wires are in a state, the two groups of routed traffic are distributed across two lines, and when any one of them is broken, only192.168.1.0/24traffic. 650) this.width=650; "title=" Bgp.png "alt=" wkiom1t5lvyrikjlaabrkb2aogq286.jpg "src=" http://s3.51cto.com/wyfs02/M01 /5a/32/wkiom1t5lvyrikjlaabrkb2aogq286.jpg "/>Method 1"R1 Configuration"Interface Loopback0IP Addre
Design of the BGP Practice Policy Routing distribution requirements for the two RoutersR1 and R2 are connected by two lines. BGP is used. R1 has two groups of routes, 192.168.1.0/24 and 192.168.2.0/24. When both lines are connected, the traffic of the two groups of routes is distributed and balanced on the two lines. When any one of them is disconnected, only traffic of 192.168.1.0/24 is allowed. WKiom1T5Lv
BGP is a dynamic routing Discovery protocol between autonomous systems, and its basic function is to automatically exchange loop-free routing information between autonomous systems. As with OSPF and RIP protocols that operate within autonomous zones, BGP is a class of EGP (Edge Gateway Protocol) protocol, while OSPF and protocol.
BGP was developed on the basis o
BGP has 5 kinds of message
1.Open (Code 1): Used to establish a connection, including a version number (such as BGP3/BGP4) Hold time=180s (is a negotiated process, whichever is the smaller Hold time), Router-id (OSPF and BGP can be manually configured), as number ( The range is from 1~65535, wherein the 64512~65535 as number range is reserved for private);
2.KeepAlives (code 4): Cycle send to maintain con
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
BGP of the Community is a route-tagging method that ensures the continuity of route filtering and selection, and is transitive. Experimental topology:650) this.width=650; "style=" width:750px;height:320px; "title=" 1.png "alt=" Wkiom1r6iu3asudqaadaniujdek733.jpg "src= "Http://s3.51cto.com/wyfs02/M00/54/29/wKiom1R6iU3ASudQAADAniUjDek733.jpg" width= "615" height= "396"/>Lab Requirements:1. Set the 11.0/24 community Property value 100:11 on R1 and pass
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
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.