BGP Suboptimal Routing
Suboptimal Routing
| Key Point | Further Details |
|---|---|
| Improperly Configured Multi-Exit Discriminator (MED) | Check MED values for correctness, ensuring they guide traffic as intended. |
| IGP Cost Issues Affecting BGP | For iBGP setups, ensure that the Interior Gateway Protocol (IGP) metrics are configured to support the desired path selection. |
Palo Alto Commands
| Command | Explanation |
|---|---|
show routing protocol bgp | Displays BGP information including MED values. |
show routing metric | Displays routing metrics, useful for examining IGP cost issues. |
show routing protocol bgp paths | Lists all BGP paths and their attributes, including MED for route preference analysis. |
show routing protocol bgp summary | Provides a summary of BGP sessions, useful for identifying iBGP relationships and potential MED issues. |
Cisco ASA Commands
| Command | Explanation |
|---|---|
show ip bgp | Views BGP routes and their attributes, including MED for analyzing routing decisions. |
show ip bgp summary | Provides a summary of BGP sessions and can hint at IGP cost issues affecting route selection. |
show ip route | Displays the IP routing table, helping to identify IGP cost issues. |
show route-map | Examines route maps applied to BGP for custom route manipulation, including MED adjustments. |
Fortinet Commands
| Command | Explanation |
|---|---|
get router info bgp routes | Lists BGP routes with their MED values and other path attributes. |
get router info bgp summary | Summarizes BGP peer status, including MED values. |
diag router bgp routes detail | Provides detailed information on BGP routes, including MED and other path attributes. |
get router info routing-table all | Shows the routing table to analyze IGP metrics affecting BGP path selection. |
Check Point Gaia Commands
| Command | Explanation |
|---|---|
show bgp routes attribute MED | (Assuming hypothetical command) Filter routes by MED attribute to analyze routing decisions. |
show route all | Displays the routing table, which can be useful for understanding IGP cost issues. |
show bgp summary | Provides an overview of BGP sessions, useful for checking iBGP setups and potential MED configurations. |
show bgp network | Displays BGP advertised networks, potentially affected by suboptimal routing configurations. |
Debian Commands
| Command | Explanation |
|---|---|
vtysh -c 'show ip bgp' | Displays BGP routes along with their MED values for analysis. |
vtysh -c 'show ip route' | Shows the IP routing table to help identify any IGP cost issues that might be affecting BGP. |
vtysh -c 'show bgp neighbors' | Displays BGP neighbor relationships, useful for analyzing iBGP setups and MED influence. |
| `vtysh -c ‘show running-config | include bgp’` |