AS7473 peering information and eBGP neighbors

interconnection points


Extensive peering arrangements are a critical component to providing outstanding connectivity and performance for the customers as well as increased service resilience through diversified routing.

Peering is the bedrock of every network and all service providers actively expand their peering capacity in line with traffic growth to maintain world class performance.

AS7473 Configuration for iBGP and eBGP

BGP is an exterior gateway protocol (EGP), used to perform interdomain routing in TCP/IP networks. A BGP router needs to establish a connection (on TCP port 179) to each of it's BGP peers before BGP updates can be exchanged. The BGP session between two BGP peers is said to be an external BGP (eBGP) session if the BGP peers are in different autonomous systems (AS). A BGP session between two BGP peers is said to be an internal BGP (iBGP) session if the BGP peers are in the same AS7473 autonomous system.

By default, the peer relationship is established using the IP address of the interface closest to the peer router. However, using the neighbor update-source command, any operational interface, including the loopback interface, can be specified to be used for establishing TCP connections. This method of peering using a loopback interface is useful since it will not bring down the BGP session when there are multiple paths between the BGP peers, which would otherwise result in tearing down the BGP session if the physical interface used for establishing the session goes down. In addition to that, it also allows the routers running BGP with multiple links between them to load balance over the available paths.

AS7473 Network Diagram

The AS7473 backbone cost burden associated with settlement-free peering traffic exchange should be equitably shared. Regardless of the direction or type of traffic exchanged between the networks, the routing practices and location or interconnection points should be such that each party bears a reasonably equal share of backbone costs.

In the case that the peering party has significant excess inbound traffic volume to deliver to AS7473 (significantly in excess of that being sent outbound by AS7473 to that party) then the parties should agree the routing behaviour expected of one another within reasonable technical, and operationally-feasible bounds.

When the peering partner has network presence in multiple countries or continents where AS7473 also has Points Of Presence, it will be desirable to open peering legs in at least two locations, and maybe more, subject to the cost/benefits of PoP build-out. This is to ensure that the traffic is exchanged optimally in the respective countries/continents and peering interconnections benefit both partners equally.

Peers must be directly connected when using eBGP. If they are not directly connected, the neighbor ebgp-multihop command must be used and a path through an IGP or static route to reach the peer must exist in order for the routers to establish neighbor relationship.

Verify iBGP/eBGP AS7473 Configuration

Use the show ip bgp neighbors command to display information about the TCP and Border Gateway Protocol (BGP) connections and verify if the BGP peer is established. The output of the show ip bgp neighbors command below shows the BGP state as 'Established', which indicates that the BGP peer relationship has been established successfully.

R1-AGS# show ip bgp neighbors | include BGP
BGP neighbor is 10.10.10.2,  remote AS 7473, internal link
  BGP version 4, remote router ID 2.2.2.2
  BGP state = Established, up for 00:04:20
  BGP table version 1, neighbor version 1
R1-AGS#

The show ip bgp neighbors command has been used above with the modifier | include BGP. This makes the output more readable by filtering the the command output and displaying the relevant parts only.

In addition, the show ip bgp summary command can also be used to display the status of all BGP connections, as shown below.

R1-AGS(9)# show ip bgp summary
BGP router identifier 10.1.1.2, local AS number 7473	
BGP table version is 1, main routing table version 1

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
10.10.10.2      4 7473       3       3        1    0    0 00:00:26        0

AS7473 eBGP Configuration with a Loopback Address

You can also configure eBGP/iBGP using a loopback address (or any other operational interface). Loopback interfaces are used in this manner to guarantee reachability in networks with multiple paths as shown in Sample Configurations of the Load Sharing Using the Loopback Address as a BGP Neighbor section of Load Sharing with BGP in Single and Multihomed Environments.

Load balancing with Multihomed AS7473 to Two ISPs Through a Single Local Router

This case shows how to achieve load sharing when multiple links exist between a remote AS and AS7473. These links are terminated in one router at the AS7473 and on multiple routers at remote ASs in a single-homed BGP environment.


ASN IPv4 IPv6 Power
AS10099           20       0       10  
AS12389           2       0       2  
AS1257           810       0       181  
AS1273           3577       369       846  
AS1299           343885       7780       46044  
AS13030           60135       0       8636  
AS17494           0       3       3  
AS209           16       206       8  
AS2119           155       0       58  
AS23947           106       0       13  
AS24218           15890       0       649  
AS2497           13765       1284       844  
AS2516           3856       1       678  
AS286           2906       440       664  
AS2914           1404       19       319  
AS3257           179905       1875       25173  
AS3303           4       0       3  
AS3320           15276       0       1859  
AS3356           140202       225       21486  
AS33891           4313       0       594  
AS3462           1       0       1  
AS3491           11826       664       2354  
AS38001           7140       252       1170  
AS41095           2334       0       358  
AS44356           695       0       79  
AS45903           1       0       1  
AS4635           1018       29       109  
AS4637           982       3       234  
AS4657           137       0       46  
AS4788           23       0       19  
AS4809           7976       0       1401  
AS4844           85442       23785       17105  
AS50304           5340       702       1052  
AS54994           0       2       2  
AS56308           4       0       4  
AS58453           3345       0       601  
AS6453           42113       518       4901  
AS6461           585688       20015       45575  
AS6730           338       0       53  
AS6762           34172       979       4946  
AS6908           36       0       13  
AS6939           19763       117348       31450  
AS7474           6       0       3  
AS7575           1238       0       181  
AS7713           9       0       7  
AS7922           5272       0       860  
AS8220           2091       49       257  
AS9002           10382       1735       1859  
AS9226           0       2       2  
AS10003           44       0       4  
AS10010           0       14       6  
AS10019           12       0       1  
AS10024           383       9       209  
AS10026           3304       0       722  
AS10096           22       0       18  
AS10310           1       0       1  
AS11051           18       0       6  
AS11164           2603       0       548  
AS11179           1058       0       281  
AS11228           234       0       190  
AS1200           4       0       2  
AS12257           597       0       77  
AS12322           79       0       13  
AS12389           10259       135       2151  
AS12390           60       0       4  
AS12496           0       1       1  
AS1257           1932       0       312  
AS1273           36       15       11  
AS1280           141       0       5  
AS12989           508       96       79  
AS1299           371       24       41  
AS13030           391       0       125  
AS13037           96       0       15  
AS131337           83       0       74  
AS13150           338       0       70  
AS132046           681       0       299  
AS132203           4602       0       90  
AS132267           1115       0       676  
AS132339           260       0       214  
AS132399           71       0       65  
AS132685           84       0       75  
AS132708           532       0       219  
AS132819           243       0       197  
AS132829           1199       276       677  
AS132837           0       3       3  
AS132876           716       162       315  
AS133170           1048       0       651  
AS133372           505       217       358  
AS133735           174       0       69  
AS133847           1208       0       234  
AS133904           98       249       251  
AS134078           326       1       97  
AS134346           694       0       204  
AS135010           463       0       192  
AS135354           166       0       29  
AS135365           507       0       223  
AS136106           9822       0       2578  
AS136168           1124       424       837  
AS13658           70       214       205  
AS136733           369       93       305  
AS136743           3354       0       235  
AS136897           664       0       192  
AS136907           243       202       218  
AS136961           1840       266       602  
AS13768           1270       0       120  
AS137831           10       0       2  
AS137870           247       0       103  
AS137922           16       6       19  
AS138005           264       273       392  
AS138138           13447       834       800  
AS13896           15       0       4  
AS13917           11       0       5  
AS14061           230       0       2  
AS14127           359       0       109  
AS14418           131       0       120  
AS14589           0       5       2  
AS14907           1       0       1  
AS15133           9       28       8  
AS15169           2       0       2  
AS15224           432       13       54  
AS15412           78       0       14  
AS15830           238       43       61  
AS16082           28       0       8  
AS16276           117       5       4  
AS16509           385       33       4  
AS16625           1072       390       230  
AS16839           561       0       131  
AS17494           72088       232       16245  
AS17511           89       8       8  
AS17534           25       26       5  
AS17547           7275       1144       1219  
AS17557           20764       675       2571  
AS17639           1530       0       122  
AS17650           84       0       75  
AS17653           263       0       217  
AS17673           9       0       3  
AS17686           15       0       6  
AS17689           0       1       1  
AS17888           5510       275       1448  
AS17961           31       1       5  
AS17984           22       0       19  
AS18059           1393       451       505  
AS18206           916       35       275  
AS18278           21       0       3  
AS1828           61       0       19  
AS18403           9199       3718       906  
AS18434           128       0       28  
AS18779           0       6       1  
AS19151           2       0       2  
AS19324           46       409       170  
AS19551           1069       0       156  
AS199524           318       0       142  
AS202196           208       335       310  
AS203926           69       0       60  
AS209           16810       80       1592  
AS20940           5602       820       1216  
AS2116           420       0       128  
AS2119           674       70       176  
AS21345           22       2       1  
AS21371           42       1       21  
AS21396           58       0       5  
AS2152           3274       0       383  
AS21859           661       262       246  
AS22363           9510       0       183  
AS226           1       0       1  
AS22616           2       0       1  
AS22764           744       0       282  
AS22822           62       19       22  
AS23576           1386       0       186  
AS23703           70       160       180  
AS23947           27277       4488       5878  
AS24012           1041       0       131  
AS24084           134       0       118  
AS24218           3284       860       1158  
AS24247           3158       268       1199  
AS24319           468       688       254  
AS24429           223       0       181  
AS24568           743       0       238  
AS2497           459       44       94  
AS2514           333       0       10  
AS2516           1853       261       152  
AS2526           2       0       1  
AS2527           138       0       6  
AS2529           66       0       13  
AS2559           569       0       118  
AS25627           213       0       65  
AS25761           102       0       27  
AS25934           699       0       258  
AS26464           492       0       55  
AS2687           598       2047       869  
AS27471           462       0       191  
AS2818           5       0       3  
AS286           49       57       42  
AS2907           1010       0       84  
AS2914           644       1       5  
AS29452           0       1       1  
AS29791           627       0       155  
AS32098           2671       0       187  
AS32354           18       0       6  
AS3257           600       1513       109  
AS3292           790       65       180  
AS32934           15       7       4  
AS3303           21       24       27  
AS3320           621       0       101  
AS33438           617       855       214  
AS3356           3367       4016       2238  
AS33597           25       4       8  
AS33891           675       0       146  
AS3462           1478       337       173  
AS34655           1       0       1  
AS3491           2791       395       393  
AS3561           259       0       214  
AS35908           804       0       4  
AS35914           96       0       40  
AS35916           61       0       1  
AS36224           525       0       289  
AS36408           2054       263       395  
AS3741           151       9       61  
AS3758           183146       42287       33932  
AS3786           949       0       44  
AS38001           9247       282       950  
AS38040           14542       12       202  
AS38082           19784       7635       2596  
AS38090           170       0       49  
AS38158           9904       371       1905  
AS38182           166       456       413  
AS38325           504       0       213  
AS38385           211       0       175  
AS39326           30       13       22  
AS40051           520       0       212  
AS40676           296       0       75  
AS41095           172       0       54  
AS41690           4       0       2  
AS43996           241       43       129  
AS44356           2946       165       1326  
AS45102           4818       0       118  
AS45147           10406       2508       2692  
AS45282           782       0       217  
AS4538           183       0       18  
AS45430           2189       406       596  
AS45494           3       1       4  
AS45499           2338       0       661  
AS45530           222       0       129  
AS45558           714       239       370  
AS45587           3054       0       588  
AS45629           661       279       507  
AS45706           343       0       72  
AS45758           1317       93       321  
AS45899           27318       2441       1256  
AS45903           1587       639       923  
AS45932           1490       5       76  
AS4628           2870       106       166  
AS4635           132       358       193  
AS4637           2249       307       267  
AS4648           675       2       36  
AS46489           4       2       3  
AS4651           14307       49       788  
AS4657           95       0       32  
AS4685           62       0       2  
AS4704           45       0       8  
AS47254           228       0       54  
AS4755           1924       129       403  
AS4761           32182       835       7514  
AS4766           1775       0       35  
AS4775           9836       429       1201  
AS4788           133       0       47  
AS4800           75       0       30  
AS4804           89776       18891       1350  
AS4809           156       0       22  
AS4837           5898       0       196  
AS4844           149       218       233  
AS4845           271       0       128  
AS4862           3377       609       552  
AS5017           1428       242       547  
AS50292           594       0       220  
AS50304           256       1       66  
AS50468           42       0       17  
AS53727           107       3       15  
AS53813           2       0       1  
AS5400           848       37       213  
AS5413           260       7       23  
AS54201           262       0       214  
AS54538           526       0       221  
AS54994           2322       1152       401  
AS55081           3       8       1  
AS55685           2159       867       665  
AS55944           42       0       12  
AS56197           848       0       66  
AS56227           268       0       221  
AS56308           1064       1125       866  
AS57976           66       5       62  
AS58451           1756       36       136  
AS58453           7047       41       90  
AS58615           521       0       427  
AS58642           260       0       213  
AS58717           6       0       3  
AS58795           782       0       219  
AS58982           93       0       51  
AS59268           264       0       218  
AS59378           8402       0       1498  
AS60486           45       0       41  
AS6067           24       0       4  
AS62044           3       0       1  
AS62194           235       0       94  
AS62955           13       0       5  
AS63362           158       0       70  
AS63399           0       1       1  
AS63631           454       275       264  
AS63673           518       0       216  
AS63888           264       0       217  
AS64050           1262       0       67  
AS6453           2232       3830       844  
AS6461           30828       1082       889  
AS6507           40       0       18  
AS6648           806       0       158  
AS6660           396       190       287  
AS6730           146       0       45  
AS6762           2776       1543       1112  
AS6908           84       16       29  
AS6939           2907       9656       3420  
AS703           50       0       15  
AS7091           4       0       1  
AS7342           14       17       5  
AS7474           452707       31454       60401  
AS7500           1       0       1  
AS7506           40       0       4  
AS7522           0       2       2  
AS7529           3       0       1  
AS7552           157640       60       6538  
AS7568           48188       3032       5901  
AS7642           1030       1       193  
AS7670           21       4       4  
AS7700           6302       550       845  
AS7713           1       0       1  
AS7843           3410       0       497  
AS786           408       16       65  
AS7922           674       180       173  
AS7991           6573       6       997  
AS8075           2       0       2  
AS8121           0       4       4  
AS8220           1196       0       497  
AS8359           1925       0       550  
AS8403           4       2       3  
AS8426           171       23       31  
AS8607           12       1       9  
AS8681           35       0       9  
AS8781           13436       72       587  
AS8897           75       1       7  
AS9002           10660       239       2042  
AS9009           900       141       79  
AS9050           1043       2       205  
AS9226           1300       510       1042  
AS9269           28       0       11  
AS9299           759       2       185  
AS9318           870       46       37  
AS9351           51       0       5  
AS9365           20       0       2  
AS9370           0       7       3  
AS9381           7129       55       694  
AS9498           83764       3       3577  
AS9505           30       9       18  
AS9506           35917       6856       1368  
AS9534           4590       3671       608  
AS9583           14668       1355       609  
AS9607           0       5       2  
AS9615           30       0       3  
AS9656           1062       275       397  
AS9658           2419       422       411  
AS9892           3046       185       157  
AS9929           5       0       3  
AS9930           9921       1007       2980  
AS9989           3310       581       1940  
AS9993           23       1       4  
AS1280           9945       0       1365  
AS14907           14025       965       2337  
AS17639           45521       1195       5691  
AS19151           35674       0       2645  
AS8426           1024       23       217  
AS8607           2078       904       599