BGP Session Establishment
BGP Session Establishment Failures
| Key Point | Further Details |
|---|---|
| Misconfigured Neighbor Relationships | Check if BGP peers are correctly configured with each other’s IP addresses and AS numbers. |
| Authentication Errors | Ensure that if BGP authentication is configured, the passwords match on both sides. |
| Incorrect AS Numbers | Verify that the AS number is correctly configured on both ends of the session. |
| Firewall or Access List Blocking | Confirm that firewalls or access lists are not blocking BGP (TCP port 179) traffic. |
Palo Alto Commands
| Command | Explanation |
|---|---|
show routing protocol bgp | Displays BGP routing protocol information. |
test routing fib-lookup virtual-router <name> ip <ip-address> | Tests FIB lookup to verify reachability and next-hop information. |
show routing protocol bgp config | Displays the BGP configuration to verify neighbor relationships and AS numbers. |
test security-policy-match from <source> to <destination> protocol 6 port 179 | Tests if the security policies permit BGP traffic. |
Cisco ASA Commands
| Command | Explanation |
|---|---|
show bgp summary | Displays the summary of BGP peers and their status. |
show bgp neighbors | Shows detailed information about the BGP neighbors. |
show run bgp | Shows the running configuration for BGP to check neighbor configurations and authentication. |
packet-tracer input <interface> tcp <source-ip> <source-port> <dest-ip> 179 | Simulates a BGP packet to check if it’s allowed through the firewall. |
Fortinet Commands
| Command | Explanation |
|---|---|
get router info bgp summary | Displays BGP summary information. |
get router info bgp neighbors | Shows detailed BGP neighbor information. |
diagnose debug cli 8; diagnose debug app bgpd -1 | Enables detailed debug logs for BGP to check for configuration errors and authentication issues. |
diagnose sniffer packet any "port 179" 4 | Sniffs traffic on port 179 to confirm if BGP packets are being transmitted and received. |
Check Point Gaia Commands
| Command | Explanation |
|---|---|
show bgp peers | Lists BGP peer status. |
show bgp routes | Displays the BGP routing table. |
clish -c 'show configuration bgp' | Shows the BGP configuration to verify correct neighbor setup and AS numbers. |
fw monitor -e 'accept port(179);' | Monitors traffic on port 179 to verify if firewall rules are correctly allowing BGP traffic. |
Debian Commands
| Command | Explanation |
|---|---|
vtysh -c 'show ip bgp summary' | Displays the summary of BGP sessions. |
vtysh -c 'show ip bgp neighbors' | Shows detailed information about BGP neighbors. |
| `vtysh -c ‘show running-config | include bgp’` |
| `iptables -L -v -n | grep 179` |
Enhanced BGP Session Establishment Checks
| Key Point | Further Details |
|---|---|
| BGP Version Compatibility | Ensure that BGP versions between peers are compatible. |
| Session Timeout Settings | Check session timeout settings to prevent premature session drops. |
| Update Source Configuration | Verify the correct configuration of the update source to ensure reliable session establishment. |
Palo Alto Commands
| Command | Explanation |
|---|---|
show routing protocol bgp | Checks BGP version and session details. |
show system settings | Verifies system-wide settings that might affect BGP, such as session timeouts. |
show routing protocol bgp peer <peer-ip> | Displays detailed information about a specific BGP peer, including update source. |
show network interface | Lists network interfaces to verify update source configurations. |
Cisco ASA Commands
| Command | Explanation |
|---|---|
show bgp all summary | Displays all BGP sessions, useful for checking versions and session state. |
| `show run | include timeout` |
show bgp neighbors <neighbor-ip> detail | Provides detailed information about BGP neighbors, including update source and version. |
show interface | Verifies interface configurations, useful for checking update source settings. |
Fortinet Commands
| Command | Explanation |
|---|---|
get router info bgp summary | Provides summary information, including session states and BGP version. |
get system performance status | Shows system performance and might give insights into timeout settings. |
get router info bgp neighbors | Displays detailed BGP neighbor information, including update sources. |
diag netlink interface list | Lists interfaces to verify update source configurations. |
Check Point Gaia Commands
| Command | Explanation |
|---|---|
show bgp summary | Displays BGP peer summary, useful for version and session status checks. |
| `show configuration | grep timeout` |
show bgp peer <peer-ip> detail | Provides detailed information on BGP peer, including update source verification. |
show interfaces | Displays interface information, helping to verify update source configurations. |
Debian Commands
| Command | Explanation |
|---|---|
vtysh -c 'show bgp summary' | Displays BGP session summary, including version compatibility. |
grep -R "timeout" /etc/frr/ | Searches for timeout settings in FRR (if FRR is used instead of Quagga) configuration files. |
vtysh -c 'show ip bgp neighbors <neighbor-ip>' | Shows detailed neighbor information, including update source. |
ip addr show | Lists IP addresses assigned to interfaces, useful for update source verification. |