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           31       0       16  
AS12389           1       0       1  
AS1257           820       0       186  
AS1273           3526       396       628  
AS1299           367065       8327       47310  
AS13030           59530       0       8868  
AS17494           0       6       6  
AS19151           41751       0       2796  
AS209           20       204       7  
AS2119           168       0       88  
AS23947           7       0       5  
AS24218           14849       0       1258  
AS2497           13507       1274       732  
AS2516           4259       1       656  
AS286           2581       448       607  
AS2914           937       28       228  
AS3257           227617       5929       29354  
AS3303           130       0       15  
AS3320           3571       0       411  
AS3356           146310       325       20631  
AS33891           5071       0       666  
AS3491           16605       432       3008  
AS3786           2       0       1  
AS41095           2391       0       382  
AS45903           2       0       1  
AS4635           1065       13       103  
AS4637           1295       2       295  
AS4766           1       0       1  
AS4788           16       6       16  
AS4809           4451       0       939  
AS4844           82299       0       10576  
AS4845           2       0       1  
AS50304           4668       842       1009  
AS54994           0       1       1  
AS58453           5154       0       1061  
AS6453           29364       445       3054  
AS6461           446104       14330       28013  
AS6730           1020       0       236  
AS6762           26082       1238       4067  
AS6908           1       0       1  
AS6939           15040       194402       30667  
AS7474           12       0       9  
AS7552           24       0       4  
AS7575           1110       0       171  
AS7713           9       0       7  
AS8220           254       6       22  
AS9002           14096       1545       2170  
AS9226           0       1       1  
AS10003           44       0       4  
AS10019           33       0       3  
AS10024           556       6       242  
AS10026           3898       0       565  
AS10096           22       0       18  
AS10310           75       0       27  
AS11051           46       0       13  
AS11164           3111       0       635  
AS11179           318       0       102  
AS11228           214       0       177  
AS12322           409       0       46  
AS12389           13687       0       2926  
AS1239           1       0       1  
AS12390           38       0       6  
AS1257           1936       0       303  
AS1273           50       0       8  
AS1280           134       0       4  
AS12989           171       0       19  
AS1299           320       0       51  
AS13030           435       0       145  
AS13037           102       0       21  
AS131219           1946       619       1215  
AS131337           27       0       23  
AS132046           419       0       102  
AS132203           3944       0       95  
AS132267           877       0       568  
AS132339           240       0       200  
AS132399           66       0       61  
AS132685           28       0       24  
AS132708           490       0       204  
AS132819           226       0       187  
AS132829           1325       248       734  
AS132837           0       8       8  
AS132876           1440       151       405  
AS133170           967       0       609  
AS133372           458       41       321  
AS133735           155       0       67  
AS133847           480       0       209  
AS133904           128       227       270  
AS134078           701       8       89  
AS134346           576       0       186  
AS135010           556       0       158  
AS135354           170       0       31  
AS135365           470       0       210  
AS135391           230       0       166  
AS136106           7342       1209       2051  
AS136168           274       6       112  
AS136733           337       81       268  
AS136743           2067       0       206  
AS136897           609       0       177  
AS136907           56       194       188  
AS136961           1700       243       558  
AS13768           1533       0       151  
AS137831           8       0       5  
AS137870           203       0       89  
AS137922           20       13       23  
AS138005           242       246       367  
AS138138           7399       768       649  
AS13896           11       0       3  
AS13917           10       0       5  
AS14061           255       0       2  
AS14127           299       0       93  
AS14418           102       0       92  
AS14907           1       0       1  
AS15084           44       0       37  
AS15133           9       0       6  
AS15169           2       0       1  
AS15224           435       7       54  
AS15412           62       0       10  
AS15830           366       0       88  
AS16082           43       0       14  
AS16232           1       0       1  
AS16276           114       0       3  
AS16509           43       0       2  
AS16625           982       195       210  
AS16839           175       0       42  
AS174           1       0       1  
AS17494           27914       11078       8313  
AS17506           160       0       12  
AS17511           88       0       3  
AS17534           9       0       3  
AS17547           7132       1465       1102  
AS17557           35740       408       2888  
AS17639           1827       0       114  
AS17650           28       0       24  
AS17653           241       0       201  
AS17673           12       0       4  
AS17686           25       0       7  
AS17888           15325       496       1043  
AS17961           31       0       5  
AS17984           19       0       17  
AS18059           1732       407       431  
AS18206           837       17       240  
AS18278           18       0       2  
AS1828           143       0       45  
AS18403           44768       30678       923  
AS18434           132       0       30  
AS18450           27       0       2  
AS19151           25       0       9  
AS19324           52       383       158  
AS19551           1057       0       72  
AS199524           440       0       190  
AS200597           3       0       3  
AS202196           189       291       281  
AS203926           71       0       64  
AS209           30372       0       2899  
AS20940           2956       884       1088  
AS2116           876       0       217  
AS2119           1134       0       153  
AS21345           50       0       3  
AS21371           58       0       27  
AS21396           75       0       9  
AS2152           3495       0       375  
AS21859           1382       235       317  
AS22363           8892       0       178  
AS226           10       0       6  
AS22764           680       0       271  
AS22822           59       0       16  
AS23576           569       0       73  
AS23650           12       0       1  
AS23703           69       155       178  
AS23947           19431       3992       4708  
AS24012           988       0       126  
AS24084           104       0       93  
AS24218           2240       1182       886  
AS24247           2928       236       998  
AS24309           1       0       1  
AS24319           463       615       235  
AS24429           43       0       34  
AS24568           547       0       78  
AS2497           399       0       60  
AS2514           338       0       14  
AS2516           1682       164       117  
AS2518           9       0       1  
AS2526           2       0       1  
AS2527           140       0       6  
AS2529           318       0       20  
AS2559           579       0       196  
AS25627           195       0       60  
AS25761           119       0       45  
AS25934           396       0       219  
AS26464           450       0       41  
AS2687           370       1981       823  
AS27471           426       0       180  
AS2818           5       0       3  
AS286           55       0       19  
AS2907           1082       0       114  
AS2914           644       0       8  
AS29452           2       0       2  
AS29791           161       0       37  
AS32098           2138       0       169  
AS32354           23       0       5  
AS3257           504       0       185  
AS3269           2       0       1  
AS3292           814       0       172  
AS32934           15       0       5  
AS3303           21       0       14  
AS3320           772       0       117  
AS33438           585       748       200  
AS33480           1       0       1  
AS3356           4031       0       1079  
AS33597           66       0       18  
AS33891           637       0       162  
AS3462           875       0       93  
AS34655           1       0       1  
AS3491           2980       0       313  
AS3561           238       0       198  
AS35908           182       0       2  
AS35914           98       0       41  
AS35916           110       0       2  
AS36224           242       0       201  
AS36408           1770       233       363  
AS36903           2       0       1  
AS36947           1       0       1  
AS3741           236       114       142  
AS3758           159639       38329       29902  
AS3786           987       0       44  
AS38001           6674       315       792  
AS38040           6809       3       84  
AS38082           16845       39546       3484  
AS38090           188       0       56  
AS38158           6208       687       1568  
AS38182           138       409       367  
AS38283           1       0       1  
AS38325           468       0       197  
AS38385           201       0       169  
AS38895           4       0       1  
AS39326           107       0       32  
AS40051           488       0       198  
AS41095           451       0       131  
AS4134           777       0       304  
AS42298           1       0       1  
AS43996           301       47       148  
AS44356           1030       84       864  
AS45102           4550       0       117  
AS45147           5690       2256       2621  
AS45282           928       0       356  
AS4538           340       0       33  
AS45430           943       725       373  
AS45494           1       0       1  
AS45499           1209       0       430  
AS45530           195       0       114  
AS45558           925       218       483  
AS45587           2850       0       527  
AS45629           570       272       451  
AS45706           122       0       29  
AS45758           1188       104       258  
AS45899           33925       0       593  
AS45903           1784       361       678  
AS45932           826       4       59  
AS46160           72       0       64  
AS4628           3600       96       160  
AS4635           553       2       120  
AS4637           5211       19       159  
AS4648           847       0       34  
AS4651           15258       56       722  
AS46786           8       0       2  
AS4685           61       0       3  
AS4704           47       0       8  
AS47254           287       0       61  
AS4739           22       2       6  
AS4755           163       0       57  
AS4761           66220       662       12257  
AS4766           2016       0       38  
AS4775           7660       238       1282  
AS4788           32       0       2  
AS4800           176       0       60  
AS4804           81852       16984       1240  
AS4809           137       0       15  
AS4812           1       0       1  
AS4837           5298       0       228  
AS4844           109       181       232  
AS4845           421       0       270  
AS4862           1575       818       500  
AS4913           9020       0       643  
AS5017           1330       572       343  
AS50292           547       0       207  
AS50304           161       0       45  
AS50468           72       0       30  
AS53727           183       4       15  
AS53813           2       0       1  
AS5400           888       0       220  
AS5413           367       0       30  
AS54201           242       0       200  
AS54538           482       0       204  
AS54994           2394       1044       435  
AS55430           12       0       1  
AS55577           1       0       1  
AS55685           2908       4739       1535  
AS55944           359       0       220  
AS56197           256       0       24  
AS56227           247       0       206  
AS56308           1380       1034       996  
AS57976           205       24       113  
AS58451           1719       32       74  
AS58453           7748       0       70  
AS58615           239       0       199  
AS58642           21       0       19  
AS58715           967       4018       337  
AS58717           5983       233       1721  
AS58795           25       0       21  
AS58982           95       0       48  
AS59268           242       0       202  
AS59378           7770       0       1893  
AS60486           14       0       8  
AS6067           24       0       4  
AS60781           1       0       1  
AS62044           11       0       4  
AS62194           194       0       83  
AS62955           2       0       1  
AS63362           58       0       27  
AS63399           5       0       1  
AS63631           524       247       249  
AS63673           238       0       198  
AS63888           224       0       189  
AS64050           2770       0       103  
AS6453           3371       1       370  
AS6461           27593       0       713  
AS6507           73       0       34  
AS6648           892       0       246  
AS6660           462       174       283  
AS6730           164       0       51  
AS6762           1869       0       369  
AS6908           93       0       27  
AS6939           2864       1064       300  
AS703           22       0       8  
AS7342           14       0       4  
AS7474           410370       37230       56050  
AS7500           1       0       1  
AS7506           40       0       4  
AS7529           4       0       2  
AS7552           173147       39       5325  
AS7568           27989       2951       4509  
AS7602           2       0       1  
AS7642           1175       5       161  
AS7670           40       0       2  
AS7700           5783       494       799  
AS7713           33       0       5  
AS7843           6188       0       884  
AS786           601       0       63  
AS7922           732       0       68  
AS7991           6378       4       866  
AS8075           1       0       1  
AS8359           2135       0       569  
AS8426           190       0       30  
AS8607           11       0       9  
AS8681           73       0       20  
AS8781           3272       9       125  
AS8897           133       0       11  
AS9002           8702       0       1931  
AS9050           1375       0       229  
AS9226           436       709       702  
AS9269           14       0       8  
AS9299           129       0       50  
AS9304           2       0       2  
AS9318           374       0       23  
AS9351           51       0       5  
AS9365           20       0       2  
AS9370           1       0       1  
AS9381           6111       294       1156  
AS9498           74640       1       4021  
AS9505           6       0       4  
AS9506           32331       6202       1283  
AS9534           4435       3095       616  
AS9583           15342       1150       593  
AS9615           40       0       4  
AS9656           974       248       374  
AS9658           2129       348       351  
AS9829           1       0       1  
AS9892           2729       211       152  
AS9930           14255       1623       3863  
AS9989           1428       327       1018  
AS9993           46       0       8  
AS1280           10477       0       1369  
AS14907           20709       1128       2663  
AS17639           41881       0       4626  
AS38001           8487       0       1286  
AS64050           26543       0       3045  
AS8426           1489       1       284  
AS8607           2741       1007       727