Regular Expressions Help - Limiting to Two ASN Prepending
I want to limit a incoming advertisement in BGP to allowing a maximum of Two ASN's both of which may be prepended.
Need some help with the regular expression.
I have the regular expression that shows only the two ASN's I want that can both be prepended.
Basically I want a customer to be able to advertise their ASN and customer ASN's, but if they don't tell us about customer/customer asn's want to be able to block these from coming into my network;
ISP1#show ip bgp regexp ^(60000_)+(59000+)
BGP table version is 56, local router ID is 184.108.40.206 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete
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